If you were looking for a chopper I'd say go with the Fehrman, however as a medium sized fixed blade I'd say go with the knife research, here's why:
Steel: Vanadis-4 extra is inbetween M4 and 3V as far as toughness and edge holding goes, so you better edge holding but not quite as tough (though more than enough for a blade this size). Also 60hrc vs 57-59 for fehrman (seems a bit soft for a medium fixed blade, though it will be easier to sharpen)
Blade: Fehrman as a FFG +1, but is .25 thick -1 (definitely over kill for a 5.5" blade, will be more of a weight and cutting ability nuisance), KR .19" thick, still a bit overkill but a little better +1, but saber grind, the flat part can bind sometimes -1
Handles: Very subjective, personally I find handles that are more general/don't have finger grooves allows more types of grip when you're using it (for example, chopping you'll want to be more of a back grip, for detail work your hand will be more forward).
I don't think you could go wrong with either, although for the price, I personally would go full custom, pick the steel, grind, thickness, length and handle you want exactly, maybe take some parts from each that you really like and add your own personal taste mixed in.