Received offer but in interview process for a better paying, likely more interesting position

So today I received an offer for a risk management analyst at Pavilion Alternatives. However, I am in the interview process for an associate advisor position at SBK Financial. This position would offer a minimum of 10k more salary and likely be more interesting, because 1. the analyst position is more of back office repetitive position 2. it would probably offer more exposure on the investment side.

The next interview for the advisor position isn't for a couple weeks and is after the deadline to accept my offer so I have a couple questions.

If I accept the offer is that final or can I still turn it down at a later time? They want me to accept by the end of the week and the tentative start time is 3 weeks Should I try to renegotiate asking for a higher salary? Possibly saying this job gave me an offer as well? Which position do you see as more long term value? I'm not really sure if I want to be an advisor or an analyst long term, only that I want the best exposure to investment in a way that is the most transferable to other fields aka buy side

I'm really trying to balance the decision in between taking the offer at hand for a job that pays less and is likely more repetitive/less engaging or declining, possibly losing both jobs but also possibly ending up more engaged and making more money. Can't make my mind up so any advice is much appreciated!