Samsung follows the carriers where as I think they have the power that apple has to force carriers to do their bidding. My S6 edge is a few months behind android patch level but I know for a fact that the exact same model in other countries is on patch 1st July patch level. Its the same damn phone. Some people complain that old models are obsolete but what about the same newish model getting the latest security patch in one country and not in another.

I have been using the BlackBerry Priv since it's release. One of the best things they have going for them is how quickly they apply the android security patches once they are available.

I think they have released every security patch on the day of the public disclosure since the Priv released. This blog post shows the release dates up until March atleast, and they've hit the Nexus release dates on all of them.

http://blogs.blackberry.com/2016/03/beating-expectations-and...

EDIT:

The beta branch for the Priv already applies 5th August security patch. Usually the official release is not that far (a week or so AFAIK).

http://m.gsmarena.com/latest_priv_marshmallow_beta_brings_au...