Wells Fargo. I worked for them for a few years and I have never banked with them after witnessing the travesty of inefficiency and incompetence, literally in my face.
Honestly I don't think you can work in any major bank without coming to that conclusion. The whole system is a mess of dinosaurs refusing to get up to date
Contrasted with Bank of America. Clean efficient operations with an eye towards doing the best thing. I've been a customer of BofA for a couple decades now.