Merry Christmas John and Don! Both great quivers and both have their place, preferences, and quirks
It’s up to you to decide which one based on your wants.
The Kanati is one tough dude, quality, and come in several models and the adjustments are endless. Have not tried the EFA but have friends who own them and they are quality products too.
To me the biggest difference is in the weigh category and it’s not a lot depending on what model you're choosing. Try and find someone who has one to try out would be the best approach or attend one of the larger shoots with vendors, John and Don may be there selling so try them out.