A quick run with MEPro seems to indicate that for those sizes in HSS the 1100 wins easily. Its only when you go to carbide at 0.25" diameter and less that the 10,000 rpm starts to show some advantage. Of course if you do a lot of profiling with small cutters then the 10,000 rpm wins every time.
I edited this one but it didn't show up so here it is again: It seems that standard HSS end-mills at those sizes will run out of steam before either machine runs out of HP. A 1/2" carbide end-mill might give the 770 a run for its money on HP though.