In most cases in the clinic flat teeth are used. If you had a large inter-ridge space then flat teeth would tend to avoid lateral forces. Also if there was a very small inter-ridge space then flat teeth would take up less space. If you have trouble getting a repeatable centric relation then its a good idea to use flat teeth. Ridge size, ridge relations, the patient's neuromuscular system are also factors to consider.
I like to use 20 degree non interfering cusps (NIC) maxillary posteriors against flat mandibular posteriors. They are as easy to set as flat against flat, probably are easier to chew with, and also look better. Use whatever your instructor suggests.
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©1999 by Julius Rosen, D.D.S.