With the 1090t, you can reach 4.4 GHZ on AIR with STOCK COOLER... with 1055t...you'll barely be able to reach 4ghz...

With water and a 1090T, you probably can reach 5ghz and more.
Thats totally untrue, on average they will have similar wall, its more probable that with 1090T you will get better one (binning), however amd process seems to be very mature so there isnt huge discrepances between them.
That said, 1090T is more tweakable and is easier to oc.