[HELP REQUESTED]: Take A2A Promo or Go Corp Dev

Hello Fellow Monkeys,

I've currently in a dilemma on what my next career step should be and would love your thoughts / to hear anyone's person experience here. In short, I'm a top bucket analyst at a strong MM and will be receiving A2A next week. However, I also have a compelling Corp Dev offer at a strong private company ($5B+ market cap) within my industry / in a space I'm very interested in. 

I am at the cross-roads trying to decide between the two and could use help identifying pros / cons of each (more-so for the Corp Dev Role). As every analyst is after 2+ years FT, I'm pretty tired and becoming pretty meh with the work (as it gets repetitive after 10+ closed deals). However, I don't want to handicap my career long-term just because I could use a "refresh" and have deal fatigue. Details below on each opportunity:

IB Associate Seat: ~$300k total cash comp, strong reputation within my team, overall good culture and great relationship with Senior Bankers & staffers. Do things / WLB actually get better as an Associate?

Corp Dev Seat: ~$200-220k cash comp (+ potential proceeds from future / near-term IPO), lean / very new Corp Dev Team (created ~2 years ago), broad mandate (i.e. not entirely focused on M&A but also strategy and other cross functional collaboration), good culture, likely ~50-60hrs a week

I'm leaning towards Corp Dev role with the mentality that comp isn't being haircutted too much (still can likely get to ~$300k cash comp in 5 years), it's worth the risk to see if I like it, have opportunity to learn real value creation skills, c-suite and board exposure, may enjoy the actual job functions more (i.e. no more stupid IB BS) and a lot more WLB to do the things I love outside of work (i.e. have a life outside of work again). I also feel like worst case scenario, I can always re-join my firm and go back to IB given my strong relationships with the team.

Apologies for the long thread but would love thoughts here from folks who faced or made a similar decision. Was it worth it? Did you enjoy the work more? Any potential cons / risks I'm not thinking about? Anything else I should consider?

Many thanks in advance!