When I built my shop in 2012.. I bought the T8 fixtures.. but then put in LED bulbs these here.. https://www.menards.com/main/electrical/light-bulbs/led-light-bulbs/sylvania-reg-48-17w-equivalent-linear-daylight-t8-led-bulb-replacement/75062-75042/p-1456889156784-c-7482.htm?tid=7405467454301585160&ipos=2
In 2015 my friend bought from LED light fixtures.. sealed unit I think as he couldn't change the bulb... his stopped working already and he works a full time with overtime job so those lights didn't get much hours before they stopped working.. they had a 5 year warranty.. he took them back and Menards replaced them no questions..
I personally like the option of replaceable bulbs especially when you have different color temp options etc.. I'll never buy a sealed unit unless there is not any other option, LOL