I went to Gunsite in '92 and '93 (250 & 499) and to Rogers Intermediate/Advanced Pistol & Shotgun in 1998.
In a nutshell, I describe the two experiences a bit like this;
At Gunsite I shot about 1,000 rounds on a half-dozen different ranges spread out over 700 acres. I got to meet and socialize with a number of like-minded folks that I would have NEVER crossed paths with at any other venue. I had great fun and didn't want the training days to end.
At Rogers, I shot well over 2,000 rounds (along with hundreds of SG rounds) while standing in the same spot. There was very little socializing and I was fairly tired at the end of the training days.
Gunsite is about the overall training "experience", whereas Rogers is simply a place to apply, measure and hopefully improve your technical skills. They are two totally different places with two totally different expectations. Do both if you can, but you will not find much comparable relevance between the two schools ..... one is an apple, and one is an orange.