Its all personal preference. Frankly you dont see too many plain T5's anymore, I wouldnt even rank them. They come on the crappy coralife plain fixtures.
seems to be more popular in the US for high end aquariums, while in europe T5HOs seems to be more popular. It all varies slightly on what fixtures and ballasts you use as well. My really really basic list would look something like
(Icecap, Ushio, Lumenarc) - T5HO (Tek, Giesemann) - LED
(I'm bias, Cree, Luxeon)
(Current USA, JBJ) T5HO (Current USA, AquaticLife)
(Coralife, other cheap brands)
4|T5HO (Coralife, other cheap brands)
5|Giant reflector pointed at tank (Natural sun)
9|Constantly exploding hydrogen balloons over tank
*5-9 added for comedic effect...sort of.