The best two stroke oil is:
1) The one you remember to mix
2) The one you like the smell of most
Going through some Valvoline Power Armour at the moment to clear up shelf clutter. Was mixed at 25:1 for the old mowers, but now at 40:1 for everything. Semi-synthetic, FC. It's actually pretty decent for the money. Stuff all smoke and almost odourless. One mower manufacturer reckons you can run 50:1 in their engines no worries on modern oils.
Usually use MotoMix for the other gear, but as alluded to above, cleaning up the shed and want to try some Penrite MC-2ST (FD, full synthetic ) just to see what that smells like. Plus it's red!
Will see what I do with my really old Pope mower from the 1950s. That wants 16:1 but ran fine on the Valvoline at 25:1. I'd be surprised if it didn't run fine at 50:1 on MotoMix or FC/FD rated oils, but parts are unobtainable so I'll just take baby steps with that one!