more heads and pump power and accessories. Does a single enclosure setup need this much misting power? No, but if you think you may setup more than one enclosure then the additional heads are nice to have. However a starter kit can mist up to 10 enclosures, but it does not have the additional heds by default.
The ulitmate also has the zero drip add-on, but honestly i don't care that it drips a cpl times after finishing the mist cycle.
I am not knocking the system it is nice, i use the mistking pump myself. But 99 vs 190... for 2 more heads, a no drip add-on and some hose lamps etc... not worth it imo. A hot glue gun will secure the hose to anything you want to and not requires holes, i like the drip, and extra nozzles are only needed if more than 1 enclosure.