How Cooked Am I

I’ve got a SA offer for a Client Services role at a top AM. Also done some penultimate interviews at a couple MM IB firms. 

Honestly don’t know anything about Client Services or what career progression looks like, but should I be trying to leverage that to get superdays at the MM’s?

Obviously IB vs Client Services isn’t a comparison for career progression and this is a crazy cope, but the name of the AM vs MM is definitely significant. 

Any paths for transitions either before FT or after? Really no idea what to expect or how I should be playing this.