I really like approval among single-winner methods. It's a clear improvement over plurality and encourages honest over strategic voting with 3+ candidates. Promoting candidate diversity without punishing voters for supporting them is the best way to help minor third parties become relevant.
Among ranked voting methods, I prefer Condorcet methods over others.
Instant runoff voting / single transferrable vote has some merit in the multi-winner proportional representation case, but isn't fit for purpose as a single-winner method.