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Oak tends to give a heavy smoke flavor, so I'd say a brisket or loin would be good. I don't think oak would be good for fish or chicken, but since I've never used it with fish or chicken, I could be wrong.
Oak is pretty mellow in my experience. Also, a good heat producer. I HAVE done all wood smokes using oak coals and flavor wood on top...sucessfully. My rec is poultry - but like I said...it's mellow so try it whereever...it won't suck :{)