Rotational Analyst or Internal Wholesaler?

I am currently working at a large investment/insurance firm as an intern director and junior partner to two advisers' private practice. Sounds pretty ok, it isn’t. 1099 income, no benefits, measly hourly wage ($18/hr, I am still in undergrad).

I have just accepted an offer to start immediately as an internal wholesaler for a small firm, 30 employees, 1.0B AUM. Tripled salary plus commission and paying for rest of school. I am available only 30 hours a week due to school, they are paying 75% salary. When I come on full time, full salary.

I also just received an opportunity to interview with a large bank for the Corporate Functions Development Program. This rotational analyst program is 2 years, 8 months in Finance, Risk management, and then HR. Placement based on performance and preference.

I am wondering what will be best for me long term. You may be thinking, you just accepted an offer and you are going to change jobs in the first couple weeks? No. I plan to work as a wholesaler through May at the very least, (9 months ish) at which point I would then have to move to the large bank ASSUMING I got the job.

Importantly, I want to stay in finance- this much I do know. I am not too certain what I want to do exactly, however. I like the buy-side, but a PM role also interests me long term.

My questions:

Internals move to externals, I know this. How sustainable is the external lifestyle, traveling as much as they do? Is there any more room for growth after external? If they make as much as my research shows, why is this role not more highly sought after?

For the large bank, I am currently feeling like this will offer a better base to build a career, but is that true? Will this move me further away from buy-side/ investment banking?

Thanks for reading, first post, excited to read responses.