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I own three Comp Cams Poly gears. The highest mileage one (Probably about 25K) has been on 3-4 cams and a total rebuild. It still looks brand new an it went into my 434 small block.
I used bronze on race motors. Poly is a much better deal. I've also had bronze last a long time, but nothing will last if you don't pay attention to the Dist. installed height.
Doug Herbert sells billet steel roller cams for BBC for about $230 ... for an extra $50 they'll press on an iron cam gear that'll let you run a stock dist gear. Small base circle another $20. Herbert maintains great reputation. Dunno ... maybe the other cam grinders offer similar option.