If you're asking which bulbs are the best for T5's, I'd have to say Hortilux or Quantum bulbs.
But you must have the proper ballast(pegasus) to run these bulbs.
Personally I cannot justify the price for those bulbs.
I use
HTG bulbs. Great price and they have performed well for me over the years.
Being they have a local brick and mortar shop, they warranty their bulbs for a year.
Not many shops will do that.