Not sure what "reusable range" is but in my short experience, the longer antennas only perform marginally better but are quite unwieldly so I personally prefer the shorter antennas. As far as tuning, if the antennas are GMRS antennas, they should be tuned properly. If they are U/V antennas, they will likely be tuned close enough but not perfect.
For range, height is might. After that, a little more power can be handy trying to punch the signal through a bunch of trees.