The Tannnoys are move lively than the Dyns I have heard (keep in mind I have NOT heard the 5.4). They also can bite if the recording allows it (very common in old poorly recorded brass music from the 70s).
The Dyns are mare laid back but they require a lot more power to "get moving".
I understand you are looking at purely a stereo sound but just for arguments sake I would that if I wanted the system to double for HT as well as stereo I would take the Tannoys. If however I had a pair of nice mono blocks that and swing volts and dump amps I would take the Dyns.
That said there are many other options at this price range ($10,000+/- 1000) including the big brands like B&W, Focal, KEF etc to smaller brands like Von Schweikert (VR5), PMC (PB1i) etc.
I would listen to at least 3, maybe more before I make any decision.