Approval, not ranked-choice.

Ranked-choice reduces transparency and understanding of the vote-counting process, disenfranchises an alarming percentage of lower-income voters, obstructs risk-limiting audits (which are essential for security), and is non-monotonic (increasing voter support for a candidate can make them lose). Further, ranked-choice doesn't actually fix the spoiler problem and won't eliminate two-party dominance.

Approval voting is cheap and easy to implement, dead simple to explain, count, and audit. Not only does it eliminate the spoiler problem, it is easy to see why it does so: your ability to vote for any candidate is independent of your ability to vote for any other.