Hi Nick,
I see the Yale Bicentric padlocks for sale on eBay all the time, whereas, I've only seen two Sargent dual shearline padlocks. So if evaluating by frequency the Sargent seems to be less prevalent. But, either choice go for a fair amount of money though with working keys - the Yale anywhere from $85 if you're lucky to $150, versus 75$ and up for the Sargent.
This is based on eBay experience only as I've never owned either lock.
There's also a Yale bicentric rim cylinder for sale at the moment:
http://www.ebay.com/itm/Vintage-1106-The-Yale-Towne-MFG-CO-Bicentric-Rim-Cylinder-/261842047141?pt=LH_DefaultDomain_0&hash=item3cf70090a5You are probably drooling over this, as I am - ONLY 1 HOUR LEFT - DUAL SHEARLINES PADLOCK:
http://www.ebay.com/itm/Old-Vintage-Sargent-Dual-Shearline-Padlock-Antique-Lock-W-Change-Master-Key-/131480847472?pt=LH_DefaultDomain_0&hash=item1e9cde8470Cheers and good luck on your bicentric quest,
Cheers and good luck on your bicentric quest,
Sean
Sean