I voted in the poll for the 10-11 sizes 😉 Since my girlfriend is a size 10 1/2 to a 11 (and also that i'm a bigger feet and soles lover)
But really when it comes down to it tickling is tickling the size of the feet doesn't matter all that much as long as they are really ticklish and the feet are taken care of good (lotioned on a daily basis etc) :super_hap
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ETA: As with other body parts, size is less important than the personality of the person who owns them!
I wear a 4 1/2 shoe size....(making it not too easy to find shoes in the USA...always have to buy them in Europe, Mexico or Japan!)
As for my favorite shoe size on others?? I'd say it's more about proportion: as long as the size if the foot is in proportion to the person, any size looks fine!:cool