I'm not sure on the cost differences, but Ron Sutton's got some pretty impressive engine packages and you can trust his expertise and the people he works with.
I've never worked with Mast, but I heard two stories on this forum. One guy had a problem and it seemed like they did a good job taking care of him. Another guy, not so much. The difference, it seemed to me was that guy #1 had a shop and some presence on the forum, guy #2 was just a regular joe, didn't get as much attention to his problem.
But like I said, I haven't worked with them and anecdotal stories from the internet are not worth much. Ron works hard to be available for you but he has distractions too.
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