They are Coopers but I guess they tried to make them a bit more decorative by painting them black, a few have been replaced by unpainted OVXs which doesn't look at all good.
MH is fine confined in the small space. For HPS it is a big issue.If they don't make small 250w fixtures, cunsumers will go to another company who does. It's not about quality anymore. it's all about cost.
They do here, it's used almost exclusively for 400 watt installations, I have seen a few 125s installed too. 115s are mostly used for 70, 150 and 250 watt lights, sometimes OVZs are used though.
I don't really care for GEs, they don't have many options and don't come in unpainted. I like AEL the best, I would use the 115, 125 and 327 personally.
Oddly OVX looks like a streamlined Unidor.