Banana plugs, Spades or a little of each?

For a combination of convenience, contact area and secure fit I like the BFA-style bananas, also known as Z-plugs. It's easy to adjust the tension, either tighter or looser depending on your binding posts, they're very quick to connect and disconnect, and the entire length and diameter of the plug makes contact with the inner surface of the binding post.

Audioquest makes a version of it and the Knukonceptz brand available online are good quality and inexpensive.

06-05-08: Unclejeff
"I have a hard time getting my spades to stay on the speakers. Whenever the maids come over I need to chech that they have not come off while cleaning.
Unclejeff "

AAAAUUUUGGGGHHHHH, You let maids near your equipment!!!

I don't even let my audio buddies that close. I have Gold-velvet rope across that end of the room. And just in case they are tempted, I have pictures of blood-dripping hands with severed fingers (and more blood). Can't be too careful.

Bananas for ease of use. I use both WBTs on Crystal Cable and BFAs on DIY cables and both work well. Cardas copper spades on the end of jumpers between sets of speaker posts.

I recently tried these BFA plugs. I believe they have more contact area than spades. I find with spades, even good ones, you need to check periodically for proper tension. They will almost always need a little tightening after a while.

Not to confuse the issue, but I prefer unterminated speaker cable ends. Yes, they can get tarnished and don't look as tidy, but in my experience, terminations tend to dull the sound. I admit that I've never used WBTs or anything terribly pricy to compare them with, just standard gold spades and bananas.