Thoughts on PS Plus tiers?

I am trying to decide which of the PS+ tiers to buy; specifically, I'm debating between "extra" and "premium". The Premium tier alludes to there being more games, but it's really hard to find a venn diagram somewhere with specifically which high profile games are in Premium but not Extra.

Is premium worth the extra? I'm really only interested in playing bundled games. I wouldn't use any of the other features.

What has y'all's experience been?