What qualities should I look for in choosing a credit union?

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Hi Bigger Pockets community!

I currently do all my banking with USAA, but it has come to my attention that it would be wise to expand my banking horizons. From what I've read, I should begin building a relationship with a local credit union. My area has 62 local credit unions. What criteria should I sort them by? What kind of qualities should I be looking for in a bank? My immediate objective is to begin acquiring multifamily homes and small apartments. I am a total REI noob with an excellent credit score, but under $5k in liquid assets. Any insight y'all may offer will be appreciated.

Thanks, Liz