Another vote for E0 if you can find it. I have always run E0 with the recommended amount of Stabil red in all my OPE and that seems to have been sufficient to avoid most fuel-related problems. If you use the mower on a regular schedule you could run E10 during the summer and switch to stabilized E0 during the last month or so, but my mowing schedule is sufficiently unpredictable that I find it easier to use stabilized E0 all the time.
I do pump out and replace the fuel if I miss a season and the gas gets over a year old.