There's not a huge amount of crossover. The shows were fairly independent, and, actually, on different networks for the last two seasons of BtVS, IIRC.

That said, it wouldn't hurt to keep your watching roughly in sync, but you should definitely *not* watch the final season of Angel until you have completed BtVS.
Source(s):
Personal judgement. Watch all of BtVS and Angel when they first aired (like half the people here, I'm sure :))


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