Not much difference between either of them with the small stage 3 turbine. The gt35r compressor will have a lot more potential with a t350, 69, or 76p turbine. The later 3 need a good converter. You won't be able to get a cheapie converter to spool and couple them. If you're not trapping 117mph then running more than the 44 is a waste especially with a 12" converter. The gt35r compressor does a little better at higher pressure ratios but most don't have anywhere near the combo to see the difference. Looks like 63lbs/min@ 2.5:1 PR. Not going to come close to that with stock heads or a stage 3 turbine. Gt35r compressor map: