I agree whole heartedly that avgas, when used correctly, is an excellent two stroke fuel.
If the compression, pipe arrangement, and jetting is correct, my personal findings are avgas will produce better power than pump.
Furthermore, it's strictly regulated (well...much more so than pump gas), extremely consistent, highly resistant to detonation, and relatively cheap.
It also stores well.
Are there fuels out there that produce more power? Yes.
How much more?
If both set ups are optimized for that fuel correctly...usually not more than 3-4 percent improvement best case.
Disclaimer...some fuels produced by elf, which I have not tested, show an oxygen content that's huge....and in turn may produce much, much more power (at huge prices)