UI? That’s up for debate. Everyone has their own preference for what “looks good” means. I personally think Damus looks best, but others may not agree.
any recommendations for android, linux or web apps?
None for web. I can’t speak for all web clients since I don’t use them all, but the ones that pass the visual test for me personally, are too unstable and buggy to recommend. Simple mode or whatever it’s called on Amethyst looks good on Android (but I don’t use android much)