well right off the bat the specs are slightly different. PC has 540 watt motor Griots has a 850 watt motor so the Griots will have more power then the PC does.
I tried the Griots and quite liked it. I wouldn't say its a beast, but you can feel the difference in the power right away. I hate the FLEX 3401. It has a mind of its own and I find it hard to handle.
I have the Flex , and couple of rotary's. and pc's . I bought it try it out and most likely replace an Orig UDM.