It is better than Ranked Choice because you are more clearly indicating what you want regarding the election:
- This person has my approval.
- This other person does not.
Contrast this with: “This person is first, this person is second, …” ranked choice. So would you consider your vote productive towards your goals if the last person on your ranked list was elected? How about the next to the last? How about the second? How do you represent that you feel two candidates are exactly the same for your purposes?
I put it to you that you might be too used to the “lesser of two evils” system we have now; Ranked choice is a “least of N evils” approach, rather than the meaningful communication you want it to be. If you want the ability to differentiate between candidates you approve of, I suggest score voting (Wikipedia) or range voting as the better way to represent what you actually feel, that being the generalization of approval voting.
Further, the actual election mechanics once ballots are deposited are much more complicated with ranked choice, and the outcomes less meaningful. With approval voting, you add all of the approvals up, and the fraction of the population that approves of person x is N(x) / N(total). If that is greater than 50% of the population, congrats, you are approved of by more than half of the voters for the office. There is no strategy required to effectively represent your needs with approval voting.
What does “Person X wins” represent in terms of the will of the people in ranked choice? They tended to be ranked higher? Could you improve a candidate’s likelihood of winning by changing how you rank people who you ranked lower? Why is that good?
For ranked choice, you’ve got to do multiple rounds, tossing out selections as you go, or you’ve got to do some significantly more interesting process (e.g. Condorcet). This is probably done by a computer. Do you trust that computer? Why? Why should I, as another voter? Can we do a by-hand recount without the computer? How? How fast is it comparatively? I bet range/score voting and approval voting is faster, and I know it can be done by hand.
The argument that a system has “been successfully implemented in a number of places” is just as good an argument for plurality voting (what we have today in the US), so that may not be the best argument.
I will grant that ranked choice is about as likely to move us away from the two-party system we have today towards an N party system as approval or score / range voting, but I have a strong and justifiable (above) preference.