RCHN: Sometimes we compare apples to oranges, bananas, and prunes on this board.
For the comparison you're making, I see RCHN as a clear stand out and own it over any of the other names you mention. RCHN is rapidly growing in an emerging field and is debt free, lets call it the apple. GV is in a boring old low margin business of electrical contracting and has a debt/equity ratio of 42, I'd call that an orange. CMKG margins are razor thin and their revenue streams are very fickle, I'd call it bananas. VTNR manages hazardous waste and bears a lot of environmental risk for being in that business....once accidental spill, DOT incident, or leaking tank could wipe out their cash....I'd call them a prune.