Tier IX sweet spot - Obj 430? Leo PTA?

Tao_Te_Tomato, on Jan 17 2020 - 13:28, said: This has popped up in a number of threads - and in my own experience, orange though it may be - that a lot of Tier IX tanks are the place to stop.  Unlock the X, but stay with the IX.   Advice is, though, that some lines are worth going the rest of the way.  Swedish TD, for instance.   So - I'm kind of improving my performance in the Object 430 (and liking it better this time around), and looking at getting a Leo PTA as soon as I can save enough pennies.   Are either or both of those in the "better to stop at IX" category?  Comments I've seen suggest that the 430U is worth the move, but still worth asking, IMHO.