I agree with the acid complaint about the Praetorian, it is unnecessary for that design, unlike for the Burster.
But I like the ossified white on both the Praetorian and Crusher, I think it makes a lot of sense, and makes them unique.
The Crusher I prefer being undersized to oversized and it having back pipes I intensely dislike, being that they would be in the way, hence largely preferring the Fireteam Elite designs over the Dark Descent designs.