Personally I have been a Wilson fan since I was a kid, they gave me tennis racquets as a junior and I have been loyal ever since. I use Staff Irons but not their drivers.
That said for this game I purchase solely on the attributes, regardless of the "branding" unless they are better than what is currently in your bag, I would not buy other clubs. I have a feeling that TM may have first rights on the best clubs on WGT so would be hard for other companies get their products on WGT with similar or better attributes.