i think both motors are fast...
the os is smooth bottom to top
and picco rips bottom to top I don't think it's faster but for the price and life you can get out of em...you can't beat it
and as with any other motor or rc product people get "lemons" not to say all of you did but it's possible I had a vspec once a 06 model i believe and blew a bearing with 1 1/2 gallons...I intended to fix it but sold it to a buddy who already had bearings and he ran it a litte(it was fast)