Assuming they both hold the same number of dumbbells, would you recommend a vertical dumbbell rack or a horizontal one and why? ALso, are those hexagonal rubber coated dumbbells the best dumbbells or do you have another preference? What about dumbbells with rubber coated handles, as opposed to just steel? Just wondering as I am in the market to upgrade my old dumbbells (which are all mismatched and pretty ugly LOL). Thanks in advance.