They both use the same controls. However once things are loaded in EM, they will be quicker in Computer Management. I suspect that the MMC for computer management might pre load some things, but AFAIK, these are the same snap ins.
Steve Jones
http://qa.sqlservercentral.com/columnists/sjones
Follow me on Twitter: http://www.twitter.com/way0utwest
Forum Etiquette: How to post data/code on a forum to get the best help
My Blog: www.voiceofthedba.com