You should ideally wipe the panes briefly after every shower. With tiles, this apparently isn’t necessary. Because in old bathrooms, the grout is always ugly. Even the silicone joints. If you don’t wipe tiles, then you just have long-term consequences; with glass panes, it happens quite quickly. So glass is preferable. I am super lazy when it comes to cleaning myself, but I also chose glass. Cleaning effort and light incidence or cleaning effort and no light and in the worst-case grout mold equals the super worst-case "new tiles." So there are quite a few arguments for glass.
Only the shower curtain or "completely open" far surpasses tiles and glass when it comes to minimizing cleaning effort.