Hi and welcome
Well, they're all great!
My personal preference would be for a 2009-2010 1.2 60hp, before the change to 69hp VVT. Basically the same as I've already got, but £30 RFL in the UK instead of £165... and going up every year...
The Mk2/Mk3 issue causes a lot of confusion...
Mk1 1980-1986 (Type 141)
Mk2 1986-2003 (Type 141A)
Mk3 2003-2012 (Type 169)
Mk4 2012-present (Type 319)
The 2012+ Mk4 319 has improved rear suspension for a better ride, slightly bigger and heavier.
The 100HP and 4x4 have some specific parts which are hard or expensive to replace (in particular the rear suspension assembly which is the main rust point on these cars), whilst everything for the standard 2WD models is cheap.
I prefer the non-styling of the 169, so it depends which appeals most to you.
I think
@The Panda Nut might have had all of the Mk3 & Mk4 models?