I'd take the Super-grade( in .300 Win), simply because I like it more. I've have 3 tikkas now, a .300 Win, .300 WSM and a 7/08 that my daughter shoots.
I just can't warm up to the Tikkas. The .300 win was a shooter, it went to Africa a couple times and has killed its share of game. A friend was on a bad luck streak on rifles and felt he had to have that one since it was such a proven commody. I let him have it with Leupold scope, all the 180 partitions I had and my best wishes. He loves it, and I don't miss it.
The .300 WSM in blue tupperware trim worked and shot as well. Another friend got it for his son and is busy pileing up whatever he points it at. I don't miss it either. I am forced to comment on how light recoiling the .300 WSM really was, at least with the 180 factory loads I tried in it. I wouldn't have believed it.
My daughters Tikka is still around, because it is one of the most cost effective ways of getting a very light rifle. 90 pound girls need all the help they can get, even if it means that the rifle feels like a paintball gun.