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Difficult call, the 70-200 is available in F4 or F2.8 constant aperture, that's a fair bit faster than the 100-400. If your intention is to do some birding forget the 70-200 it really doesn't have enough reach. If you're prepared to compromise a little and use a prime, the 400mm F5.6 is IMO a better lens and quite a bit cheaper than the 100-400.
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