I love my 4 bulb HO T5. I got a 100 watt LED for the veg tent but it doesn't have as good of coverage and the plants were showing issues when I was using it so I put the T5 back in and will just keep using it. I don't have time to be worrying and fiddling around with PAR, VPD, temps, etc... With the T5 the plants were always healthy and lush. Plus the distance requirement with the LED takes up too much vertical space in a 4ft tall tent.
I'm sticking with the T5 in the veg tent. One thing I noticed is that when I had the LED running some of the plants were exhibiting some of the same issues I see people posting about all the time. What's wrong with my leaves, etc... I never had any issue with the T5.