Hagen Glo or Nova Extreme T5's, which is better

[skabooya]

Ive been looking at the 36" 2 bulb fixture (Hagen Glo) vs the Nova Extreme and I like what Im reading about the Hagen. Recently however there is a rumor that the hagen fixtures and bulbs are being discontinued.
Does anyone have any experience with putting different bulbs in the hagen fixture? Do Geismann bulbs fit? Aparently the hagen bulbs are weird measurements so other T5 bulbs wont fit. I just want to know how true this is.