If you are going to use T5 just keep the bulb as close as you can (within reason, don't get too hot etc)
Keep the plant height to an absolute minimum and ideally make the growth occur horizontally. I say this because the fluro's start with a not very impressive light intensity and it drops off pretty rapidly with distance. BUT- it does have enough energy and there are plenty of people on this site who can show pictures to prove it. It's all about shaping the grow so the light is being used efficiently and all the bud sites are as close to the lamp as possible. Even with a HPS, if you grow a 2 meter tall upright trunk, more than half of the plant won't get enough light with only really the very tip doing well and the rest will go to waste- so you always have to manage your canopy what ever you use..... but just as a disclaimer, i'm not a T5 grower i'm just talking from a logical point of view and also based on seeing some great photo's of other people's grow.
As for comparison- that would be tricky to do because if you compared my 2m tall under HPS example with a even canopy scrog with bud site close to the T5 then you could say "HPS sucks, my yield was tiny. It has nothing on my T5" when the difference wasn't really the light but how each of them were used.