Not to stoke the fires of the rivalry again between the cities BUUUUUUTTTT,
Edmonton by far has a more sustainable and robust economy if only because it was never fully dominated by one industry the way that Calgary continues to live and die on a single resource that is increasingly irrelevant to the global economy... Not exactly a solid economic foundation on which to build a house never mind an empire on. Having said that, Edmonton is still dependent on O&G to keep all its other industries afloat so... yeah...
If I was to encourage people to invest in Alberta (which I always will since I think it's probably the best long-term market that has yet to peak) I will say Edmonton is for Tortoises and Calgary is for Hares. If you can handle the crazy high-risk high reward pace of Cow-town, god bless. Otherwise, the very chill, laid-back friendly-ish vibes of Edmonton are certainly my speed. Then again, I'd consider Edmonton more of a chill, place by date but rather hard-core by night... So, sexy librarian?