I always base my wheels off of measurements. In your case, since the difference is the same (9.5 & 10.5 vs a 10 & 11) I'd go with a 275/305 combo as the difference of 1" is 25mm so you could shoot for the 30mm (275 vs 305) which is pretty much spot on, or you could go 40mm (265 vs 305). However, they both end up looking right about the same once you consider the 35mm aspect ratio (my verbage could be a bit off as I've been drinking the past few hours).
In the end, it's really a toss up and you can't go wrong with either.
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