What is the difference between Halo laser and Venus Viva laser?

I am struggling to choose between which laser treatment to get. At the medispa in the town I live in they have the Venus Viva so it would be really easy to go there. Plus I know them which is a bonus. However there are very few reviews on the Venus as compared to the Halo which gets great reviews but I would have to travel out of town to get the Halo done which would take additional money and time.