Stratton is closer to home and is almost 1000 feet higher up, which can make a difference in fickle southern Vermont. the terrain at okemo and Stratton both suck, but I give Stratton the edge on their tree skiing offerings. yes, sugarbush is almost as far as stowe, but I'd much rather have options at killington and stratton further south as opposed to okemo and Sunapee. I would literally never go to Sunapee.
I can see that... plus unlimited at something closer to home vs unlimited farther away.
Keep in mind that Killington has said on their facebook page that Pico is not included in the Ikon offering. Might be worth confirming this if Pico is important to you as part of the package.