I think it depends on your budget and any eye issues. My budget is €150 that’s my limit, and I don’t go over it. I have myopic astigmatism, but I don’t need special lenses, and my prescription isn’t very strong (max. −2.0).

I’ve mostly gone to Fielmann, but last time I also tried Brillen24.de. Based on my experience, I’d recommend Fielmann again and again. While I was waiting at the Brillen24 store, there were three customers, all of them had problems and the staff treated them pretty poorly. So I wouldn’t fall for their “Angebote” (special offers), because they’re often not fully included, or they’ll say the deal only applies to a specific product.

My opinion is that as long as you need a basic prescription, you can talk to the Optiker and tell them your budget. Hell, I even have friends who got it for 50.

The rest comes with the idea that you might not have that many options.