A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,417
You need to calculate the status miles you would earn in various FF programs for the flights you take and the specific fare classes your purchase.
I would generally agree with the advice to pick one program, which implicitly means picking one alliance.
Do you do other travel, specifically flights within Canada?
Note that many status benefits only occur for flights operated/marketed by the carrier on which you hold status. For example, as a *A *Gold flying UA, you get lounge access for international itineraries and special check in lines, but you only get Y+ seats for free if your status is with UA. So there's an argument for doing the FF program of the airline you actually fly--but there are also arguments to go for Aegean for easy status or to pick LH, UA, SQ etc. for particular award availability.