As everyone on ac knows I'm probably the biggest sammy critic, nether do I intend to own one anytime soon, they just don't interest me tbf.
As for your question, The current version of touchwiz looks great tbh. Hell, I don't even mind it over stock android at this point (though I doubt you'd like it). As stock is just too skeletal, bare-bones and boring tbh..
I feel that TW has now surpassed the htc sense ui (which is frankly meh) and the lg UI (which is honestly very ugly).
The fact that the icons are now all aligned (squirlces) is a massive go to me adding to the fact that touchwiz allows themeing (proper one at that). I also read that TW will now allow custom icon packs too.
In terms of features, there's just nothing that comes close to touchwiz. The only problem here is that stock is catching up to some features that separated TW from the rest, so very soon, I fear TW might loose its edge here.
In terms of aesthetics I don't think any other UX is better (although this one is personal), while in terms of performance, well, let's be honest, touchwiz has shown itself to be one of the worse among all the top UI's so I can't vouch for this current one, but if their animations is anything to go by, then it seems like it has improved massively too.
So it all depends on your tastes, however, my rating is this
Features: Touchwiz is clearly no 1 (the features are endless)
Animations: Touchwiz is currently no 1
Aesthetics: Touchwiz is debatably number 1 at this point imo (except for the flashy colors), but this ones all personal though.
Performance: well, well, well, I don't see touchwiz showing its age properly (compared to stock, sense, lg ux), although this new one shows promise
However this features might be enough to tempt you away from any other platform
1. Theming
2. Emergency mode
3. Multi-window
4. Samsung pay
5. Game launcher
6. Private mode (you can hide your pictures/video with your FPS)
7. Ultra power saving Mode
8. One handed mode
9. Picture in picture
6. S health
7. App hiding
8. S pen