A sales tax alone is the worst choice, because of its disparate impact on the lower income earners and the people who do not live in Anchorage and the Valley. The people who live remote pay higher prices on items so they would have to pay a larger amount of sales tax. The low income earners would see a larger percentage of their income being paid into a sales tax then the high income earners who do not have to spend all they make and are able to save and invest their then untaxed money.
Also, you left out the fisheries and the non-resident contractors who would pay income tax, but no sales tax.
Just because a sales tax alone might be better for you, does not make it a better choice for the state.
My personal choice is to tax the churches and the corporate earnings that seem to have plenty of money and would have little to no impact on my wallet.