We've had both now. Love the glass, despised the curtain. Keep a squeegee near your glass enclosed shower. After EVERY use squeegee the glass down. It stays great! No spots! Curtain ... pain in the neck. Sticks to everything, water sprays between curtain and wall, getting floor wet, looks ugly after a while, wears out, curtain hooks break out the holes, replace them, they are usually too big (wide) and now you've got a lot of bunched up curtain that serves no purpose.
If it's under my control, I'll never go back to a curtain... same in the house too. I remodeled and got rid of curtains and put in glass.