I am actually testing out an HD7 right now and the choice is really coming down to the phone as the service is basically a wash for me.
I am most likely going to go with the trophy because the buttons on the hd7 are just a pain to use. They are so countersunk into the chassis to keep the design sleek, that its hard to press them accurately. The camera button I find almost impossble to click w/out moving the phone some.
The screen is pretty nice, but its also quite large...its difficult to use it with one hand. I think the 3.8" screen with a better DPI will work better overall. I will miss the 4.3 on rare occasions when I stream HD video though
I think the trophy will serve me better as a phone until some Microkia goodness comes out