Has to be these guys. How many others have the guts/strength to be cutesy in a war
(yeah, I'm gonna see about parking an alt there later)
Even with some nuances thrown in, the highest average/top strength should be Masters - and probably for quite some time. Lynx/Outlaws/One also have some very strong players in lower density. I'm not used to seeing SNinja super active, but they are doing very well in the latest Clan League. Of course, this is all afaik since i'm not super active and dont stalk people.
edit: I'm not a clan fanboy/hater so I think I can actually claim to be somewhat objective. :P
Also. Clan League is one of the most serious competitions between clans. Here's a link to the current top tier. https://www.warzone.com/Forum/330667-clan-league-11-division-official-thread
You could also look at clan placements in ladders.
Edited 9/9/2019 00:22:16