$3000 deductible, other than the fact that the plan with the higher deductible should save you around $250 a year
in premiums (which means
in 2 years you would save the $500 difference
in the deductible by paying lower premiums), there isn't a lot of difference.
Both carriers you have mentioned are well reputed, stable carriers, it is just that Aetna is PA based and not likely to leave the Individual market in PA!