Either would work.
The springs are just the curved metal straps running along the lenth of the plug that you push into the jacks.

I suppose dual springs should offer a stronger hold in thoery. Although I had some dual spring (Radio Shack generic) banana plugs that continusously fell out of my speakers compared to some single spring plugs I purchased elsewhere. It's all in how well they are made.

With great power comes Awesome irresponsibility.