Nice to know that you are looking forward to a more Indepth experience with records and turntables. You already have a great start as the Pioneer PL12 is a nice turntable too.
Your turntable categorization if really spot-on (vintage vs modern) but there is another categorization which is also relevant, namely the drive-types (idler vs belt vs direct drive). For anyone aspiring to take the dive into deeper waters, this categorization is also a very important factor.
So let's divide the turntables that you have mentioned into these 4 categories:
- Idler turntables - Garrard 301, Garrard 401, Lenco L75
- Belt drive - Linn LP12
- Direct Drive - Technics SP10, EMT 938
- Belt-Idler - There is also another sub-category known as Belt-Idler turntable into which the Thorens TD124 fits. This is a drive methodology which is a hybrid of belt and idler drive designs.
Let me add some more of the big vintage legends to your list:
- Idler turntables - EMT 927, EMT 930, Garrard 301, Garrard 401, Lenco L75, Lenco L78, Lenco L88 (considered to be Lenco's version of the Garrard 301), Garrard 4HF (for hi-fi mono)
- Belt drive - Linn LP12, Thorens TD125, Thorens TD160, AR XA (AR XA is considered to be the simplest, cheapest and the most legendary of the lot, similar to the NAD 3020 in the integrated amplifier space)
- Direct Drive - EMT 950, EMT 948, EMT 938, Kenwood-Trio L-07D, Sony PS-X9, Nakamichi Dragon CT, Technics SP10 MK2, Technics SP10 MK1, Technics SP15, Technics SP25, Technics SP20, Technics SL1200/1210 (especially the Mk2), Pioneer Exclusive P3, Yamaha GT2000 (+ there are other DD turntables in this category from the likes of Pioneer, JVC, Denon and Sony)
- Belt-Idler - Thorens TD124, Thorens TD135, Thorens TD121 (single speed version of the TD124), Kenwood-Trio PC 400U and Kenwood-Trio 400M (which is the broadcast version of the PC400U)
There are a few rules when going down the vintage route:
- Budget - they are generally expensive and have to be imported, however you may get luck and come across someone in India who has already done all the hard work and can supply you with one which you can just pay and buy without worrying about all the headaches of importing
- Plug and Play vs Customization - some of these decks have everything, just plug them in and play whereas come would require a custom plinth, a tonearm and cartridge, etc. It is always very simple to get one with everything included vs having to run around buying and building things (if you have the DIY flavors, then running around can actually be an advantage)
- Condition - Most of the ones generally available in India are discards. So the truth is, you cannot get audiophile grade quality out of a vintage deck which is purchased, unless someone is letting go of a perfectly restored pristine turntable, due to upgrading. Mostly, you will have to get it professionally restored which can cost more than the deck itself. Hence when buying, always factor in the restoration part of it as well. Most high end decks like Garrard 301 found in India are just old stock decks that have been subject to some cleaning and lubrication. To get better results, a Garrard should be serviced by the likes of the Classic Turntable Company (they turn the deck into a new one running at factory specs). They upgrade certain parts, replace certain parts, calibrate spring tensions, etc which enhances the performance.
- Maintenance - Direct drive turntables require the least maintenance. You may have to re-cap them every 15 odd years. Belt drive turntables in Indian climatic conditions would need replacement belts between 5-10 years depending on the part of the country you live in. Idler turntables on the other hand require regular maintenance to keep them running noise free. Apart from all of this, regular lubricating (about once in 5 years) is required for all types of turntables as they have mechanical parts after all.
- Availability - depends on a lot of luck, it you have access to markets abroad, that's always the best (especially in Europe). Depending on the type of deck, one should be cautious when buying from the US or Japan as some decks have mains voltage and frequency dependencies so simply using a 230v to 110v or 100v stepdown won't work
If you have control over these 5 aspects, then vintage is the route to go. If you try to find the same level of quality and engineering of vintage turntables in the modern ones, you will have only few options to go by at exorbitant prices.
The choice of model and make is the user's prerogative. If you check online, everyone has their own preferences and opinions, so as a buyer, you too should have your own and go by it. Evaluate all the factors by reading as much as possible and thereafter decide.
Many of the classic turntable manufacturers like Garrard, Thorens, Technics, Denon, etc have returned with modern versions of their classic vintage turntables mentioned above. However most of these are exorbitantly priced and out of the reach of the average enthusiast. The new releases of the Garrard 301, Technics SP10 and Thorens TD124 are examples. An Indian like you or me can buy a home or a few cars with the amount of money one has to pay for these.
But....
If you are looking for a modern (brand new) turntable with vintage build quality and sound characteristics, then Technics is the way to go. They have brought back the classic SL1200 and SL1300 in new avatars which are really superb and perhaps even better than their vintage ancestors. The brilliant strategy of Technics has also helped, they have different versions of the same models so depending on your budget, you can buy different versions of the SL1200 or 1300. This could be the best and easiest path to pursue. From my personal experience, with a Technics (vintage in good condition or modern new turntable), you can never go wrong.
There is another chapter altogether about cartridges and phono stages but first decide on the path with the turntable. If you choose a turntable version without a tonearm, then that is also another consideration which you will have to get into.
Wish you all the very best!
Regards.