I just moved to NH and I've never skiied any of these resorts. Need help picking, who has better snow?
Okemo & Sunapee for $650 or
Killington & Pico for $629
For an advanced boarder Killington/Pico will have more challenging stuff to keep you entertained over the course of a full season. If the travel time is more or less the same that is what I'd recommend. I think Killington is a great place ON WEEKDAYS. It can be pretty brutal with crowds on prime weekends, but that's when you head to Pico which is a pretty interesting smaller mountain. Killington seems to be trying to reclaim their crown of King of Spring in recent years so they may offer a good long season too. Okemo and Sunapee are great cruiser mountains. Okemo has some great parks and Sunapee has pretty scenery near a lake. Conditions-wise Killington, Okemo and Sunapee all make tons of manmade snow and should compare pretty close. Some might say Killington Peak would catch a little more natural because of slightly higher elevation.
You will get more ski days at Killington if you like spring skiing (I generally skip the early season stuff, but that is available as well). For the last 3-4 weeks of Killington's season, you're going to have to be willing to deal with bumps if you want to get a high quality goggle tan.
My pick would be Killington. However, I have not skied either mountain on a peak winter holiday, so I can't compare the parking/lodge/lift line situation when the mountains are crowded. The suggestion to hit Pico instead of Killington during the peak periods sounds very sensible to me.
I've alternated between the Killington/Pico and the Okemo/Sunapee pass for the last few years. The two are different animals. Killington has a lot longer season, challenging terrain, and more of it. Pico also has a lot of diverse terrain for a smaller mountain, and has the advantage of being a lot less crowded on weekends. The other three are all a zoo on the weekends. But if you know the mountain, I find I can usually avoid the crowds pretty well at Killington. Not so much at Okemo/Sunapee, I've not had as much success at beating the crowds there. But it really comes down to the terrain. Both of them have superior snowmaking. If you're looking for long, well buffed out cruisers, then Okemo and Sunapee would be your best choices. If you like your skiing/boarding a little more on the wild side with lots of off piste options, including early and late season, where grooming sometimes takes a back seat, then Killington is your kind of place.