Never7 is nothing compared to Remember11 if you want to 100% it. Otherwise, Never7 has six routes IIRC and 13 endings I think, but Remember11's two routes pack a total of 33 endings, out of which only more or less five are worth seeing. You need to see around half of Never7's endings to get the full story (except bad endings) but for Remember11, if you use walkthough there's one particular bad ending that adds to the story while other bad endings are optional (and some are just "boom you're dead").
Remember11 is highly recommended (except that finale, ugh...) , Never7 is... alright. But Remember11 definitely takes priority.