I suspect that there's a large proportion of the international aquascaping community that agrees with your suggestion that T8 lighting is better than most common LED...
Personal experience is that most all aquariums running in the house (maybe 10-15) use LED lighting, all freshwater aquariums are heavily planted. Most of the LED fixtures (including the older version of the originally posted finnex 24/7 planted+) are out of the box from regular retailers.
The only reason I know of people sticking with T5HO, or halide fixtures, is due to CRI or penetration issues.
Unless you intend to keep plants that require a high enough level of light that you need to supplement CO2 and fertilize the water, chances are that you will be good. I don't know if you can turn this model down if using the 24/7 feature, but you can if you have it on a timer and just turn on and off.
Alternatively look at professional aquascapers, local planted aquarium societies, mass media, competitions, or reputed online communities (say the AGA's Facebook page for example) and see what everyone is doing.
I also have the latest Fluval planted aquarium light (the V3 one) and I like it.. wish the color was more adjustable though.
