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I choose based on the drivers themselves, and my car of course. Usually it equates to a 2nd order filter combined with whatever works for the sub, but it's dependant on a lot of things. 2nd order is enough for most mids since a 2nd order x-over will keep excursion constant as frequency gets lower. 4th order may allow it to play lower if the excursion is enough.

I recommend 2nd order for HPF for mids because that's their natural roll off slope anyway so it's smooth.
I cut off subs with 3rd or 4th order slopes to keep bass tighter.
those are just starting points though.. you can always tweak them to find what works for your setup.

my recommendations are moderately generic starting points because the questions are always "where should I set my head unit crossover for my amps?" and if people can't figure out a basic starting point, I offer one.
it's nothing set in stone though.

i think he reccomends it that way so it flows together easily and for people with less exprience it is alot easy to get it to sound good.

Hay Kiki, I noticed you tend to recomend using a 2nd or 3rd order X over slope, where as Jonathon tends to recomend a 3rd or 4th order slope. I was curious why you perfer a shalow slope, instead of just cutting the sub off and setting your component X over a little lower.

Actually this is for anyone. What slopes do you tend to lead towards, and why?