If you don't want to drive the extra miles, choose Stratton over Okemo. I skied Stratton 2/23-24. The base was good and they were blowing snow. I didn't see any bare spots. In fact I was impressed that despite rain on 2/20-21, the snow was good. Yes, they had groomed almost every trail so there weren't too many moguls to be found on the mt.
Stratton is a better mt with more interesting terrain and somewhat steeper options on the north facing parts of the mt. In late March, you need a mt with as many north-facing slopes as possible. And Okemo is too flat.
I'm heading to Killington for the Easter vacation. After the Thanksgiving snow/mud situation, they gave us vouchers to return this season so we will go then. In general, Killington has the best water supply for snowmaking in VT. This year the water supply issue for snowmaking was crucial. I know that Sugarbush and "I think" Stowe had water shortages during much of January which prevented extensive snowmaking.
As for Jay Peak, just after you have driven until your legs are asleep and the family is bouncing off the walls, you will drive another 40 minutes from I-91 to get there. And our Jay Peak Barking Bears seldom rave about the long flat runouts required to get around the mt. Don't get me wrong... the glades are excellent with fresh snow, but the rest of the mt leaves much to be desired. I am one of those that says, If your that close to Jay Peak, go to Stowe and really be challenged!
Let us know what you decide.