You'll never notice the difference in sound. And you'll never rock so hard that a lead comes off a speaker. I'm sure there's an exception, but probably because of someones else's error.
That said, my wires are 14g soldered. It's a royal project to swap speakers. But I think I found what I like.
If you want a real project, mod your jack for stereo/mono, and/or different impedance's.