Career Change Advice - Two Possible Directions

Hey All! First thread for me here on WSO.

Background:
I am currently a Big4 audit manager and have been in the field for about seven years. I have done some soul searching this summer and have finally pulled the trigger on making a career change.

In my current role I have been a part of our emerging growth company practice, which in my area, is really focused on market development and building relationships with start ups and local VCs. Being a part of this has really made me realize that I would love to either be a part of a start up or eventually make it to the investor side and join a VC/PE group.

I currently have two cogs in motion: I initiated a transfer to my firms M&A Transaction Services group, primarily focused on FDD, which I will likely be approved to make the move in the coming months. However, I also have an offer coming from a start up that has recently completed their Series A and is looking to raise a Series B in the coming months.

I'm looking to get your guys perspective on what may be the best move if my ultimate career goals are to move to VC/PE at some point? Obviously moving to M&A will at least give me exposure to the deal environment but running a finance org at an early stage company will give me modeling experience along side operating experience.

I know this comes down to personal preference but would love to hear everyone's opinion!