The outsides of the bldgs is one thing, but they're both new on the inside. I think that will ultimately decide the question. Capabilities based on classrooms & related technology, instructor pedigree, public areas, ameneties, etc. On the range, how many lanes, distance, programs offered - IDPA, USPCA, etc. and ultimately, will staff be normal people, or range-nazis. Another thing that may be a factor is the location. For peole unfamiliar with the Frederick area, the Machinegun Nest is probably easier to find, with much less traffic in the area. Finally, how much will they cost, and will either have requirements to buy ammo there, etc. All that aside, it's impossible that either of them will be able to beat the price of nearby organizations with oudoor ranges.
In a huge decision authored by Judge O'Scannlain, a split panel of the Court of Appeals for the Ninth Circuit has ruled that Hawaii's ban on open carry outside the home in that state violates the Second Amendment under any level of scrutiny. The decision, Young v. Hawaii, can be found here. The decision is very scholarly, carefully reasoned and a powerful statement that the Second Amendment is not a "second-class" right or a constitutional "orphan."