depends on your space and how many waTTs you want to run..... No matter what, if you are in a square style or close to square style space, Octagon will always produce more, but stadium is good if your room is longer, like a 4X8 you still won't get the coverage floor to ceiling that you do with a multibulb vert, but it's easier to work in space like that with a stadium. You will definitely need to use 1k bulbs to get results with stadium where as vert you could go to 400's in a 4x4 space if you wanted..... I'm running 600's in a 6x7, but all the growth is caged in a foot all the way around the room so it ends up being more like 4x5.... lIKE i SAID IN PREVIOUS POST, THE HARDEST THING ABOUT VERTICAL IS WORKING AROUND EXPOSED LIGHT... aLL THE PEOPLE THAT READ THESE POSTS AND GET ALL GUNG HO ON VERT HAVE NO IDEA WHAT A DIFFERENCE IT IS BEING RIGHT NEXT TO YOUR BULBS, COMPARED TO THEM SITTING UNDER A HOOD..... tHAT'S WHY YOU STILL DON'T SEE A LOT OF oCTAGONS AND VERT SET UPS, JUST THE SAME OLD SCHOOL FLAT GARDEN GROWS... aND IF YOU DO DECIDE TO GO VERT, DEF SET UP AUTOMATED WATERING IF YOU DON'T JUST GO FLAT OUT HYDRO..... I will never run soil again in vert... I will stick with mist from here on.... first run is almost finished and i'm a;most done building the mist set up and am going with 3 levels this time instead of 2 and double the amount of plants witha little bit of a shorter vedge this time.... Would be stoked to see anyone else that is doing vert