you'll do fine edging with mythos on slabby to vertical terrain, but you'll have a harder time with overhanging boulder problems/sport routes. for smearing they are the bomb. lots of hard routes have been put up with mythos, into the 13's for sure.
that said, the TC Pro is definitely a better edger. but, edging is more about crunching your toes and raising your heels anyway. sure, you'll edge better with the TC Pro's than with mythos, but the difference that good technique makes is orders of magnitude more than the difference a more aggressive shoe makes. just make sure you're focusing on the right things :-)