Re: Telescoping vs. migratory covers?
kspitze, I don't know how many hives you eventually plan to run. I'm heading toward 50, and prefer telescoping covers for several reasons.
I can lay the cover on the ground, upside down, and stack supers/hive bodies on them, minimizing squished bees.
I put popsicle sticks under it on the corners, over the inner cover, provides perfect winter ventilation.
Keeps rain out better (judgement call?)
But, as mentioned, it is simply a matter of your preference.
"If all you have is a hammer, the whole world is a nail." - A.H. Maslow