A center oneway is a little less aggressive on power than a front one-way. A front one way is basically a spool on power.
I always run a one-way of some kind on a 4whl offroader. Small tight slick track, big open high bite tracks, blue groove, tacky clay, loamy. The problem for me is I like alot of corner entry steering and you just cant get it with full time 4wd. Tires only have so much traction available to them, so if your using some traction for braking, you have less that you can use for steering.