Mardi Gras vs. Fantasy Fest

[maxtower]

Ok, So I have been to Mardi Gras, and it was pretty much the best time I have ever had. My friends and I have always wondered why there wasn't another Mardi Gras since 1 year is such a long time to wait. Then the other day I found out about Fantasy Fest which is supposed to be pretty similar to Mardi Gras, except in Key West during Halloween.
I am interested in hearing from anyone who has done both. How do the two compare? I am pretty much planning to go to Fantasy Fest this I raise my expectations too high.