I have to admit that I've never been to Mohegan Sun, but Foxwoods is great. Very big, lots to see and do, tons of gambling. And I'm a poker player, so I can only go to Foxwoods because Mohegan Sun got rid of their tables last year.
My biggest recommendation is to not go on a Saturday night because it's going to be very very busy. If you do slots, you'll have to separate, and the tables are all full.
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