If you care about speed, then go with the Droid 4.
If you care about having an open bootloader, replaceable batteries, a bright, clear screen and prefer functionality over speed, go with the Stratosphere.
I might be a little biased, but I love my Stratosphere. I am running TweakStock 1.4 and its like my crack. I haven't had any issues with this phone that the other people have had, except for the slow downs when trying to do too many things at once. It's true that this phone is running with 2010 specs... but with the price tag most places of FREE, its hard to complain for what you get. If you get rid of the bloat and run lean, you won't have any issues.
I bought a Rezound recently but after a day with it, I had to go back to the Stratosphere - I'd rather have a phone that functions the way I want with a full keyboard than a phone with speed.