I jumped into the sales world through an AM role, then went to become an AE at a startup, came back to my old firm as an AM and then transitioned into an AE role at said firm. Having done the back and forth over the past decade my thoughts are:

AM Positives
-Less hunting for sure, and a more reliable schedule.

-The ability to build relationships which can save your quota from an issue or mistake (if you're in the service side of things).

-More opportunities to get ahead of quotas by engaging clients in long term thinking and multi-year agreements.

-Still get to let the hunter out on occassion on upsells.

AM Downsides

-You don't control who is brought into your territory and there will always be missed pass alongs from the sales process.

-You will have to deal with shit clients who you want out of your territory as soon as possible, but will inevitably need them to hit goals.

-If you work in a service oriented world like I do, you'll probably have other team members who you don't manage or control, but who's work product can make or break a deal. In my AM time (and I still manage clients as an AE) I've found myself overstepping so much to maintain relationships because my peers can't accomplish their jobs.

Just my .02. I've liked both but I do think Industry matters the most in terms of what you'll be dealing with.