I usually recommend a solid cover for gunite pools or for those that like to close right after Labor Day and open just before Memorial Day. The lack of sun light hitting the pool in the off season prevents algae growth. Unless you close a pool with the water temps under 60, any light will permit growth.
With plastered pools, the algae takes a bit more work in the Spring to clean out when using a mesh cover. More work is as compared to a liner or F/G pool, both of which have smoother, less porous surfaces. The water is normally clear but there is growth if you close too soon and open too late.
This isn't alway the case. Some pools, such as those with longer raised beams or rock formations may be better suited for a mesh cover since they are physically lighter and while the wall anchors for the better covers are plenty strong, a heavy, wet snow load is better supported by the stronger mesh covers. Those with larger dogs that use the cover as an extension to the yard area are better off with a mesh also. Toe nails can pierce a solid cover. With mesh, the nails can go between the threads.
Yes, most mesh covers are stronger than solid covers. Not all solids, anymore than meshes, are of equal strength. Cover construction is important. Better covers use heavier thread, stitching, , webbing, cabling, and anchors. Cheap covers are just that. They are cheaper for reasons that don't benefit the end user.
There are some cover manufacturers that claim their mesh prevents the light. Trust me, enough light get in. Not always, but enough.
Pools with waterline tile need an automatic step pump to keep water off the tile line. Ice expansion can pop and crack tiles. Even solid covers should so when a snow load displaces water in the pool, it can be drawn off. I like the Little Giant ACP-500 for this, especially if there is a deep end swim out with a step. The swim out step is typically an inch or two lower than the tile time, the perfect height.
Scott
Scott