1+ for T-5's used em for 2 years LOVED THEM.
In my opinion and any tank that is 4ft, I like the T-5's for the reason that they run cooler and you can cram 8 bubls over a 75gal without having too many heat issues. And with T-5's there are many different combo's of bulb color to where you can get exactly what you like: be it more blue, less blue, more white, or even yellow. I feel you have more control over color with t to the fives.
On the other hand, my 24gal aquapod has the 150 mh and I too love that.
LIke everybody says just do a little research and see what you think you will like. BTW what tank is this going on?