Definitely B&M for me.
They are smooth, more rerideable, etc.
And what! The brake run ruined Nitro? Naw.
AC's brake run.. when you exit it, it gives you a nice, healthy dose of flojector air!
Intamins, as far as I can see, provide too much flat parts. Sure SROS:SFNE and EGF look cool, but I still would take B&M over anything. Maybe except EGF and MF. But I haven't ridden either! However, I plan to ride MF this summer AND ride EGF next summer!
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The Jet Coaster ROARS!