It's a question of money really...
If you've got the money, get the Aztec!
If you don't have the money, why would you buy or rent a TB20? There's a lot of much better aeroplanes to choose from.
Probably you want to look at a Comanche, or Twin Comanche, or a Robin with a better performance with fixed gear!
I haven't flown a TB20, but I have flown the TB10
, and I have flown the Aztec
I'd trust an Aztec anywhere, in any situation, over a TB, any day!
And you can whistle the tune from 633 Squadron while you go