Embassy is closer to all the happenings, I've stayed there a few times as well, but more expensive. The rooms are comparable in size but Embassy has split it into two rooms with a connecting door for some privacy whereas comfort suites is one big room. Embassy has a small kitchenette, comfort suites does have a microwave and minifridge. Embassy has a HUGE breakfast buffet and a ton of room to sit down but does enforce the room key thing, meaning if you have some off the books roommates they probably ain't getting in.
I haven't stayed at Embassy for about 5 or 6 years but I hear its aging, they have super slow elevators and anyone staying in the front room should probably be a heavy sleeper or have earplugs.
Having said all that I think, except for the cost, Embassy is probably the better place to stay.
The only reason I stopped staying there was because I go solo now and felt bad for taking such a big room just for myself. (and now the housing lottery makes it problematical since its probably the most wanted hotel in general)