Vickie, You talk to 10 growers.....you will get 10 different answers. It all depends on your growing conditions.
I'll add my
worth. I just repotted some seedling vandas. With my growing conditions, I prefer wood baskets because when I water my plants I also soak the wood basket. Possibly it's wishfull thinking, but I believe it helps to raise the humidity around the plant.
If it were mine I would put it into a 6" basket. Try to thread the long roots through the slats in the basket. If it has grown to the plastic basket, I just cut out some of the ridges to give the roots more room to spread out, and place the plastic pot into the basket. Yours would possibly need a 6" wood basket.??????
I have had some of my vandas grow fat roots, almost like small cigars, and I'm sure they would not fit through the small holes in the plastic baskets. I only cut off the dead roots but leave the good ones, Vandas don't like to be disturbed any more than necessary.
Just my thoughts, not written in stone. This method works well for my in door conditions. I live in Michigan and growing them outside is not an option.
Marilyn