I think they'll yeild different gains depending on how your motor is setup.
I'm primarily a duner, I previously ran T5's for a couple years. T5's are great pipes, sweet on the dunes...but I wanted a bit more low - mid range grunt so I tried the PC's. The PC's suit my style much better. The power delivery is a bit more spread out than like the T5's. I gained a deekload in the low end over the toomeys, and they pull hard up to the top end,...the T5's have a better top end, but I've not regretted making the switch, the PC's just suit me well.
But like I said T5's are nice, especially for flying around the dunes. You will be happy with either I guarantee. If you do more trail & MX riding I'd say the PC's will suit you better there, but in the dunes; to me it's a toss-up, depends on what you want out of the pipe.
Just don't go DG...