I’m not very well-versed on all this but it seems
First Past The Post
Benefits the two parties in a two-party duopoly system like that of the US. Boom or bust, black or white. When the party in power pisses you off you vote their competitor even if holding your nose.
Seems like there must be a better way, maybe just not as good for those who prefer shooting fish in a barrel
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.