I use a MVB on Nero's enclosure and a halogen/reptisun 10.0 tube on Soleil's tank. For me the biggest difference is the brightness. I have a lower wattage halogen flood lamp right next to the MVB because it wasn't getting quite warm enough for Nero and it wasn't nearly as bright as I would like. From what I've been told by Bob Mac (Mega Ray), it is best if you don't move the MVB too much or bump into it, etc. As that can damage the filament inside and lessen the life expectancy of the bulb itself. So if you needed to move the lamp fixture to get into the cage everyday, twice a day it may be better to stick with the tube/halogen.
I think in the long run the cost is about the same really, around $25 for the Reptisun 10.0 tube + $8 halogen flood bulb + fixtures $35 or so = around $70. Replacing the tube 2x year = $50/year.
MVB - $47 bulb (lasts about a year) and $10 fixture. So again, about $50/year.
Not sure if that helps... :lol: