I'm not particularly familiar with any of those FMCs. The q400 just used the old X-plane default, so I got used to using that and being proficient at planning SID/STAR wpt by wpt. haha. Whatever I did last night completely broke the FMC though, but I think there's a bug right now from what I've read in the support forum for the 175. Anyway, that's just a learning curve thing, like anything else.
I'm frustrated enough from getting that to fly that I need a break for a night or two (took 6 tries to get the plane to take off without breaking anything, and even then the pushback thing was still broken).