I voted for banana, but I will qualify that and say "
BFA style banana".
On every amplifier and speaker I've had, they have made a beautiful tight-fitting connection. And they are so easy to remove and replace.
The WBT locking banana may be good too, but I have no experience with them. I've used several models of 'regular' banana plugs, and they have all been, more or less, wobbly.
Spades can work very well also, but they must be firmly tightened down at all times, and are more of a hassle to remove and replace.
Steve