The warranties on both units are long 7 and 10 yrs. and extend beyond technologies.
Looking at the buyer reviews over at Newegg and Jonnyguru.com and the price differential ($259 and $309), I'd probably go with EVGA ($349/10yrs). Early on Corsair ($309/7yrs) seemed bullet proof but as time has gone by, it seems like their QC has declined.
Let us know which you choose and how it turns out.
CORSAIR AX1200i VS EVGA 1200W
Which one would you buy for your gaming computer?