Expansion/AM Vs. Hunting New Business

I'm interested to hear experiences of anyone who has seen both sides: Account Management/Expansion as well as being responsible for hunting new business as an AE.

Would be interested in learning about upsides/downsides of each and how they compare.

I'm currently looking for my next role. I'm pretty open minded, but feeling like an AM role might limit future opportunities that require full cycle closing XP.

Thanks!