Given equal distances to get to them, I'd probably go with Creek as well, although I do prefer Blue in some ways. But I haven't ridden there in quite awhile and I don't know what the maintenance has been like. The last time I rode there, it seemed like most trails were starting to suffer.
Edit: read the post again - you said blue trails. Blue is pretty much ALL blue trails - even their black trails are like blue trails nearly anywhere else. I would argue the Empire jump line trail is the only true "black" trail on the mtn. The food at the Slopestyle Pub is better, IMO, and the convenience of being able to ride-in and ride-out is cool. And you get to enjoy the fun stares from regular patrons wondering why you are wearing armor, moto gear and have a full-face helmet.
And as much as I do like Thunder, if I'm still in NH next year (unlikely) I'll get a pass to Highland again, partly because it's half the drive time away. If I'm home in PA, I'll probably get a pass to Blue since it's closer to my house and especially work if I want to ride on Friday.