First of all, Congrats! Two job offers is a great problem to have. Ultimately, the decision is yours so I'm not going to tell you to go for one job over the other but rather give you my thoughts on each and how they may (or may not help you down the line).
Credit Analyst at Community Bank: There are a lot of opportunities out there that require candidates have some type of 'credit training'. For example, you mentioned you want to go into fixed income. Working with corporate bonds will require you to have some type of background in credit (generally), so this type of role can give you a good head start. Also, every community bank is going to have an investment portfolio that they invest their customer's deposits in (which will be mostly invested in fixed income products), so depending on the size of the bank you may be able to get involved with helping manage that eventually.
Sales Support at Prudential: You can leverage this role to get your Series 6/63 paid for and potentially CFA dues paid for as well. Many opportunities within the fixed income space will want you to get some combination of FINRA licenses and the fact that you already have them will be attractive to a certain degree. I'm not sure where you're located, but most of Prudential's investment functions are out of their New Jersey Headquarters (from what I've seen). I've never worked at Prudential before so I don't know how they handle moving candidates around internally. What kind of 'sales' will you be supporting? Insurance sales? Think about the skills you will gain in the role and how they might be leveraged in a more 'investment' related role in the future.
Source: I am a CFA Charterholder, have my Series 7/63, work in Fixed Income and work very closely with community banks.
PM me if you have more questions.