We considered but rejected the solid "safety" cover (also Anchor), which comes either with a mesh panel in the center or with a pump that sits at the low spot on the cover. Besides being much heavier (harder to handle) and somewhat more expensive than mesh, I didn't like the idea of all the debris piling up right under the mesh panel (although that might be okay) or having to remove the pump during freezing conditions (according to the instructions). If it weren't for that freezing problem, I think the solid cover with a pump would be ideal for my conditions. Mesh is certainly ideal for warmer, tree-free conditions.
The pump we use with our Anchor solid safety cover has freeze protection.