[starscream]

I haven't experienced any performance difference between 32P and Mod1. As long as you use a metal pinion and plastic spur, you should be good.
Its more a matter of finding the appropriate setup that will accomodate the gear ratio you need. Its really up to you which route you take. I made the switch to Mod1 because I wanted to use the Revo slipper so I invested in some Mod1 pinions (They didn't have the tmaxx .8 metric spurs at the time). I then needed a larger spur so I got the Strobe slipper from Mike and used the 51T Mod1 spur.
The price between the two types of the gears are practically the same. I would recommend choosing the pitch that gives you the most options for now and future use. If you think your future applications will never use Mod1, then 32P should be fine. If you ever see yourself doing any 1/8th scale conversions or using 1/8th scale center diffs, go with Mod1.