I have a few Schoolcraft coins, and they are really something else. Great quality - better than I had imagined.
I don't have any Lassen ones; I tried to order some from him, but got tired of waiting. Gave it a mont, then ordered from Schoolcraft. Had my coins delivered before Lassen returned my emails.
Also, Lassen tends to rub me the wrong way on his blog - I realize that it has nothing to do with the quality of his work, but it's my preference not to deal with that kind of thing is I don't have to.
Another one to consider is Roy Kueppers. Have a gaff of his, and it's really impressive. Total gentleman, great service, great work.