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I am sure from what I've read on here you will be happy with either of them. Personally, having owned Harleys since the 70s, I find I always go back to Avons.
As for radial versus bias ply, I think you will find most tyres for Harleys are reinforced and tend to be bias. Best to check out the recommendaed tyres for your bike with your chosen brand.
This is what Avon recommend for yours, assuming it is a 2006 model (not 2007, as the tyres changed):
Front tyres:
Venom
Pressure front:
2.6 bar (38psi)
Front size:
MT90B16 74H (also WW)
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