I have owned both the Mk IV Golf GT TDI 150 and the Mk IV Golf GT TDI 130bhp version.
Out of the two I actually prefer the way the 130 drives!
I prefered the way the turbo kicks in on the 130, it seemed to have more of a turbo spike to it and a smoother delivery, the 150 gave one hell of a bang, then felt flat to me, sorry if I am not describing it very well 😉
I had the electric window motor go on the 150, seems it can be a known problem looking online, was also advised to swap the water pump plastic impellier blades to a metal version, when doing the cambelt, as they can go too.
Did not notice any real difference in fuel eco between the two and for overtaking there both have more than enough punch to overtake safely.
Did 170k in the 150bhp and my 130bhp is on 100k with only the elec window motor being an issue so far, not the best handling car out there in its standard form and you will need to watch your right foot on tight roundabouts in the wet with the 150, apart from that, its all good.