Nzbgeek and nzbplanet are good. From my experience these 2 have very similar quality.

Drunkenslug is a lot harder to get into but it does find items the other two don’t have on occasion. On the downside, drunkenslug lacks a one time subscription and the other two have a one time subscription. It does however have a free tier so you can probably be fine still using it as a last resort to try finding harder to get content.