1.8t is cheaper to tune but more costly to fit and probably more costly when it goes wrong
Everyone says the vr6 is heavy but there are enough cars out there running them to know what suspension etc to run to get the most out of them, i also remember a thread somewhere (dont think it was on this forum) about the weight of the vr6 compared ot the 1.8t and i think once you took into account the intercooler and the rest of the associated parts between the 1.8t and the vr6 conversion there wasnt actually a lot in it