top20 is/was a list a group of players/builders put together of their favourite/strongest endgame builds by set of requirements of the char. Endgame setups being key there.
Primal Strike is almost an absurdly strong and fun levelling build, and (imo) does completely fine for endgame (different players have different tolerances for requirements and all that), making it an amazing starter/general build to have in your lineup, regardless of top20 endgame list entries.
It’s one of the most popular and recommended starters/levelling builds for a reason, so don’t let a hyper focused endlist mention start questioning if it’s worth to level 
, - you can’t go wrong with PS
Fun stuff from top20, to me, was chaos sabo, Avenger, aegis archon(lightning retal entry), Ludrigan and Light’s Defender(technically i preferred their LD Elementalist in tryouts, but that version didn’t make the list and they chose Purifier)
*Since those are endgame setups stuff like spam Aegis outright isn’t doable during levelling/until level 94 and as such play a bit a different until then
scroll down to the honourable mentions for VoS cold PS 