[DreamSword]

Not to mention when it comes to the common reader, and in-universe, everyone being able to recognize who is who via color is quick and easy, especially in the heat of battle.

Personally I prefer it this way, as it focuses more on the Turtles' personalities and character traits, rather than simply whatever gear they happen to have. And it offers a neat bonus of getting unique stuff out of it. Having a bunch of pages dedicated to trying out unfamiliar gear would just be padding, giving the general flow of the crossover.