What are the preferred choice of securing speaker wires on the amplifier outputs? I've always just put the speaker wire in the output and tightened the screw down. Is there a better way to make a better connection?

 

"Better" is subjective. Car audio is not the place where a better connection is going to sound better and Good Enough is all you need unless you are after a certain look.

 

I use banana clips because I remove my subs for track days. Bare wire is just messy when you're doing that.

 

Spade terminals are your friend!