The xtrasun looks like the same shape as my hydrofarm daystar, my daystar spreads light fairly wide so if you want spread go with the xtrasun. my daystar spreads good over a 6x4 table.
The irradiator looks like the shape of my hydrofarm radiant, the radiant has a more straight down focus footprint of light, this would be good if you are doing a frame for scrog. I use my radiant for 4x4 scrog.