145 or 156 ??

Hello, since my golf unfortunately makes me so slow, I thought about trying something different than VW. Can’t decide between the 145 and 156 unfortunately. From the course the 145 would be quite enough for me, however I wonder if I will be able to reach something more than 100 HP. What does your opinion mean for and what against the 145/156? Have read here already several times about torn timing belts with 156. What should I pay attention to when buying? Is there a special Bj. there should I avoid? Thank you very much.