Real tough to say. Often it comes down to your tolerance for dragon abuse. I've had 1.2's in the past that worked out OK. I currently have 2 m/f pairs that work well and I have 3 females in a group that work well. Then I have lots of singles that don't work well in groups at all.
One of my oldest m/f pairs had to be separated this season. It is a shame as they get along very well. But, for some reason when he breeds her now she bleeds from her vent. It's not an issue of him breeding her too much as some people think happens whem males live with single females.
Three in one cage sounds easier but it's really not always. You have 3 times the poo and three times the dragon feet to spread it all around if you're not home all the time to clean it up right away.
On the positive side. I feel that the dragons have a better quality of life if housed with others. They get more exercise and the interaction between the dragons is more mentally stimulating that just laying there looking out.
If you decide to try it, you will always need to have other accomodations available in case of problems, injury, etc.
The floor spaces of my cages are either 5' x 3.5' or 4' x 3.5', I have 6 - 5' ones and 6 - 4' ones. They each have 2 basking spots. The picture is from the winter when the 4 hides under the basking platforms are blocked and many of my dragons are brumating.
