Whilst I might not be totally upto date on what is out there, I would say stick to decent leads. What can be acheived from a proper gold plated jack and good insulation is invaluable. If you want to run about on stage fair enough, and don´t get me wrong I am not against a good bit of playing around on stage, but in my opinion it comes down to music, that´s why I am there and your sound is always going to sound better through a lead. I am an old stick in the mud so if there actually is an absolute mint wireless system these days I am prepared to stand corrected, but I have tried and failed. Plus I truly believe it is all part of the training to learn how to spin round like an idiot and then avoid falling on your arse whilst remembering your solo/backing harmonies.
Maybe I´m getting old......