I believe Jason was asking because Thornbirds tend to leave a bad taste in some ppl's mouths, but it is all personal preference.
The 15x10 will give an overall "bigger" look, but will tend to rub more. I personally like the look of 15x8s on 33x12.5s, it gives a "beefier" tire look. As far as which performs better, there are many different opinions on this forum.
Robb
btw: you are the first Mathews member I have seen here. Where abouts? My parent's keep a boat in cobb's creek