Grisaia is overhyped, over inflated and has one of the lamest, overpowered, nonsensical protagonists ever. That said, it has good character interaction and is adorable. If you can overlook complete lack of logic and a Deus Ex Machina protagonist, there's some decent comedy and a whole lot of disappointing heroine routes.
Evangile is cute fluff. Not overly deep. A bit sappy, and the most interesting girl in the story doesn't get a route. It's okay, not great.