Ok, I'll say it... There is quite a bit about this topic (I know because I recently made the decision) on this forum, do a search, or better yet, check the first topic on the top of the page. Generally speaking though, they are pretty much the same, except the 220 is tuned for more low end power, but sacrifices some top end. Their are different mods for each one that will get them both some good juice across the board. Do a search in this forum and you will be rewarded with plenty of straight forward answers, or just wait until someone posts a clicky!