I think the Boatneck has a bit of a V to it, so it may be like some late '50s Strats (not that I've ever played any to know!). The Fatback is more rounded so perhaps that's more like a big Tele U shape.
They're both a full 1" deep for the whole length of the neck, from nut to heel. I haven't tried either but I'm pretty sure they'd be too big for my taste!
From reading the Warmoth forum, I don't think the Boat is a very "hard" V so even if you're not keen on V necks it may be OK. I've also read that if you have a 1-5/8" nut rather than anything wider if makes the neck feel a little less huge.