4 x 4 tent..2 x 400w or 1 x 600w HPS ?

as the title says : 4 x 4 tent..2 x 400w or 1 x 600w HPS ?

run sog in 1gal cloth pots, pro mix, jacks 5-12-26

I'd say 2 400W would give you a better yield, but a 600 would be easier to maintain.