Always go for a CE armor.
And, honestly the best back protector is something like Bohn. The back protectors that come with the jackets won't be as good as a standalone protector that you wear under the jacket.
Speed and Strength and Icon seem to be marketed to stunt riders. Not sure why. I've never worn the stuff.
Personally, I always like to buy the stuff that is worn by road racers. A-stars, Joe Rocket, etc.