T-5s are good, they are also still fairly expensive to buy lamps and ballasts for.

I also see a much higher failure rate with T-5s.

I am sure the technology will improve and the price will drop,

With that in mind I would light a typical garage with T-8's they work well, are inexpensive and durable.

JMO, Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts