The first thing you need to do is determine what your listening preferences are. I'm not talking about vague type preferences either, but ranking the most important attributes of a good speaker in your opinion.
I'd be asking myself questions like:
1.) What volume level do I listen at?
2.) What kind of music will I be listening too, primarily?
3.) Is the ability to handle very dynamic music convincingly important?
4.) How important is frequency extension?
a.) Do I need to recreate very deep bass to be happy?
b.) How important are extended "shimmering" highs?
5.) What will me seating position be and will that be ideal with the speaker I choose?
6.) What kind of efficiency will I need to reach the output levels I need with my listening position and the power I have available?
7.) Do more subjective qualities like imaging, soundstage, and the like take a priority over some of the other attributes of a speaker?
Once you've gone through that process, you might be abe to eliminate one or the other from contention purely because of the lack of ability one may exhibit. For instance, a full range fostex trying to pull off some dynamic classical piece with 20-25dB of dynamic range will likely fall on it's face at anything but very low levels.
Or, if 20hz bass is an absolute requirement, perhaps you are going to eliminate a full range driver or start considering the addition of subwoofers to cover the bottom end.
My subjective preferences have progressively shifted towards speakers capable of large scale dynamics as I've found that they seem to pull off the realism I desire and speakers that aren't capable seem congested in comparison.