What style of battlemap do you think works better? Something simple, quick and easy, or something more detailed and elaborate?

Personally, I've been starting to feel like detailed battlemaps are a waste of time. Too many hours of prep spent making a map you'll use for maybe a single session. They also end up feeling railroady, as in your players can't really go places to fight you've not pre-prepped with a map.

>pic related: simple battlemap idea