Much of what I'll say here has been already said or inferred in one way or another, but I'll add that, while U.S. Ph.D.'s are generally more prestigious than U.K. Ph.D.'s,, an Oxford degree will probably go farther than a BC degree at the same master's level both in the policy circle and in the academia (whether a master's degree can be helpful in the Ph.D. admissions is another discussion). I suspect that both programs will be more than an adequate stepping stone for a PhD program, but, for the same expensive price tag, which program would be a safer bet? BC wins in the U.S. networking category, but Oxford probably wins in the rest of the categories.