Barring building a custom grow room, I have to say that Gorilla makes the
best grow tents. I've tried Lighthouse, Secret Jardin, and a couple other manufacturers and none of them seem to come close as far as overall quality and consideration of all of the tiny little features that Gorilla does.
Currently using a 2' x 4' Gorilla standard (not their LITE) and I expect it to be used for 5+ years to come, which is more than I can say for just about any other tent I've used.
There are sometimes pinhole leaks or zipper light leaks, but they're much smaller than any other tents for the most part. And the extra features + thicker fabric in general makes them the go-to pick for me.
Only problem is, you gotta pay for all of that extra goodness - they ain't cheap!