Para2 seems like the better one to start with now. One of the quintessential Spydercos, it seems. Plus, the compression lock came before the BBL, Sal before Eric. Not exactly the rationale you're looking for, but hope it helps.
“Damned infernal gizmo. My kingdom for a left-handed can opener!" — Mr. Burns, The Simpsons
Thank you, Mr. Sal Glesser ... and Mrs. Gail Glesser![/b][/color]