Flexibility. A bit more light intensity in the Vertex 260. Also a decent more actinic in the 260 compared to 200. I have an APEX but control the light through bluetooth with my Mac. It is very simple and I did not have to call in someone smarter than me to figure out how to program it.
Simple is my style, but I want something easy to have maximum control features. I know the vertex are expensive, but saving a couple of hundred a year in light bulbs, power savings, and the lack of heat issues has me allmost convinced.