SE was competitive with UA top tier even before the recent UA cutbacks (and looks even better now). Its the rest of the tiers and basic membership where Aeroplan isn't competitive.
A basic member of UA's program (or AAs, or NWs etc) is guarenteed seat availability to where they want when they want. Prestige and Elite do NOT get this with Aeroplan. A FF program without seat avialability is a joke.
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Saturday nights should be spent with family.