for me id say the T4 as opposed to the 2.0t, but then as an owner of a T4 of course im gonna say that
LTEcactus is correct about the phase 2 cars being a little more refined and modern, although in a t4 sense, and especially if you wish to venture away from standard in terms of power output, the phase 1 with the b4194t unit may be a better option, because given that the phase 1 is 1855cc, but still makes 200hp, it comes with a forged bottom end as standard, which lends itself to power upgrades more readily than the later 1948cc b4204t5 phase 2 cars, although these are still great, as that's what mine is.