if your weekend travel will have you staying in *wood properties, *points convert into airline miles at a 1:1.25 ratio for AA and 1:0.5 ratio for CO (actually I think still 1:1.25 ratio right now, but changing soon). Also, I think AA's hubs are in better locations (do you really want to connect through CLE?), and (as much as I love NW) I think that OneWorld is less plagued by trouble than SkyTeam, as an alliance.

Of course, none of this really matters since I myself was swayed to join NonePass upon reading the earlier post of real, live hot towels!! What luxury! What tantalizing bliss! So long NW, so long UA, CO here I COme!!