An independent Alberta would face the Dutch disease effect crashing the employment figures, wages and viability of everything except oil and gas. At least a 10% jump in unemployment in two years.
51st state with the USD absorbing the excess productivity however? It comes down to the negotiations. Right now, huge Albertan budget surpluses get sent to Ottawa to be spent outside of Alberta (largely as a carrot to inhibit other independence movements), which is what motivates the Albertan independence movement. Any Albertans would hope the US to be more egalitarian.
However, the US might put them over a barrel and make similar revenue flows a condition of joining, which would be the smart play for Washington (possibly with some tariff and travel restrictions sticks if they don't). If the 47 admin is bankrolling the content farms producing this independence movement (as Orban was the Daily Wire) then the US has all upsides.
Canada fractured and easier to loot and Alberta entirely undefended from looting. Somehow, I expect that the only Canadians recognising this attack surface are a few bureaucrats too low down in Ottawa to get their voices out and that the parties will just try to fight the anti-independence tactics in the culture war moralising style of the now-departed Freeland, which is a decade out of date and powerless to sway the Albertans.
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Generalising away from just Canada, one of the great weaknesses of liberal parties worldwide is electoralism. They cannot look at the electorate they have over their desire for the electorate they'd prefer they had. To paraphrase PG, if you don't ditch people who prefer being right to winning you'll deserve the outcome they produce for you.