You:

if you're considering a cofounder who you don't want to give equal stock to, do you really have the right cofounder?

Mark:

I meet far more second or third time entrepreneurs who wouldn’t do a 50/50 (or 33/33/33) partnership ever again than you would image.

I am one of them.

Based on my experience, I'd recommend finding a co-founder you want to split equity evenly with before you start up as you recommend.