don't really want metal bananas unless you 1) never let them touch when they are connected to the amp or 2) cover with some heatshrink, they make clear. 1) can cause posts on AK about how to fix an amp.
What Blue Shadow said...I have a friend, he was asking me why his fuses were blowing, sent me a photo of the back, you could see his metal bananas were touching.....good thing the fuses were doing their job
I have both spring clips and binding posts. The only difference I have found is that the binding posts should be checked now and then to make sure they are still tight.
So, I guess you can count this as a preference for springs.