Why would a frame make so much difference?

TipsterStu Posts: 74
edited September 2011 in The bottom bracket
I've just cannibalised my Spesh crossroads and put all the kit except headset and seat post onto a Surly XCheck

The ride is unbelievable in comparison ... does a frame make that much difference ... or is it the crank shaft that was replaced during the transfer from bike to another when my old one broke

Just wondered ... either way I'm happy as larry