After listening to all the pros and cons I decided to go with slatted bottom racks. I inadvertently ordered them from both bushy mountain and betterbee. While painting I notice from one supplier the slats ran with the frames, from the other supplier the slats ran perpendicular to the frames.
As one came pre-assembled the first thing I did was run back to the directions of the other to figure out how I could have screwed it up. Well, I didn't. In something as uniform as a bee colony or the Langstroth hive shouldn't the direction of the slats make a difference?
Any comments or theories?
Or is it the difference between a tomato and a tomato.