My opinion my be mildly biased but I've noticed many with mesh covers in my neck of the woods open green, while with mine, a solid and a single mesh square (to allow water through) always opened clean.
In theory, if you open and close while water is less than 60 degrees and with enough FC to last, you'd be fine either way.
But here in Michigan we can get wide temp swings in March, etc., and even November. I think that's why so many open green with mesh, even though light is not "supposed" to get through.
Pool techs like mesh because its lighter and easier to handle. I no longer close at all because I use a air supported done for winter operation, but I used to hire techs to close in years prior because I found the cover heavy to handle.
They'd wanted me to replace with mesh, but admitted more folks opened green
If I ever go back to closing for winter, I will replace my old cover with a new solid with mesh square because to me it was the best of both...never needed a cover pump, but never had much silt get in. If leaves are left to decompose on mesh, fine silt does seem to get in. With either type, its a good practice to blow or rake leaf debris off the cover.
Ymmv.