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There is also Type R Poncam which I think has just come out, 250/9.15mm In&Ex. Just to let you know.

As far as I can tell, power output wise, Type B ultimately produce very slightly more power, i would imagine the difference is in what sort of shape of power graph it'd produce on a dyno.

The key feature between the two sets, is how much overlap you will experience, with Type B - More Overlap, More Scavenging...Type A - Less Overlap (exhaust valves closing earlier). This will determine how much torque, how much power at what rpm. A lot of is over my head so I would like to hear more learned views on this.
I know some tuners go with matched camshafts (same duration on both sides).. and some stay with mismatched durations...
Sorry I can't help more.
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