Which is better a secured credit card from capital one or getting a secured card threw my bank?

And my bank tells me i may need a co signer in order to get a secured credit card threw them. I don't want to have to get a co signer which is crazy to me. I'm trying to weigh my options and don't know what to do? I'd rather not go threw my bank right now but i'd like to know which is better going threw capital one or threw my bank? If you've had a secured card threw your bank how was your experience and did it eventually help improve your credit?