What I write, might be a bit biased, but I don't see any reason for using snipMate, when there is UltiSnips by SirVer. Don't get me wrong snipMate is great, or better say - was great, but now it's just so far behind the UltiSnips plugin.
Be sure to see screencasts posted in the README
of this project - to see the proof of what I said above.
Good luck.