I have both and they are both great mods for different reasons I really like the consistent hit of the provari set it at 5.4v and it stays there until the battery drains a day and 1/2 later fill up a carto tank and I am good for a all day vape, my Reo grand I fill a 6ml bottle and its good for a few days I've been using the 4.8v battery in it and an 1.7v carto so the hit is really nice on it my biggest complaint is the 4.8v battery life isn't the best but that's a fault with the battery not the Mod. what ever you decide you'll probably really like it. I think my next mod will be the redsky mark-8