Hi Reuben,
If I remember right, and you would do well to Google this instead of taking my rusty memory for this, the fixed headshell one had a lighter tonearm weight so this means it could handle a different set of lightweight carts. So that's more the difference It's probably a less versatile arm due to the availability of carts that fit it. There are simply more carts that fit the heavier removable headshell arm, which is made more versatile by the fact that you can vary the headshell weight itself to your intended cart.
Regards
Edit: I think the bearings were also changed and some plastic introduced which might affect the sound quality.
If I remember right, and you would do well to Google this instead of taking my rusty memory for this, the fixed headshell one had a lighter tonearm weight so this means it could handle a different set of lightweight carts. So that's more the difference It's probably a less versatile arm due to the availability of carts that fit it. There are simply more carts that fit the heavier removable headshell arm, which is made more versatile by the fact that you can vary the headshell weight itself to your intended cart.
Regards
Edit: I think the bearings were also changed and some plastic introduced which might affect the sound quality.
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