I've caught a lot of bass on Ned rigs, it is about all I'll fish when the water is cold. I'd say 80% of them are hooked in the roof of their mouth, which as we all know, is made out of bone. You want a hook that is sharp and also stout as you don't want one that will flex when driving the point through that bone, if it flexes it will just scrape across that bone and you'll miss them. I get my Ned heads from a guy who makes them himself and he builds a shroom head with a #2 Mustad. No flex in that hook and it is sharp out of the box, but I'll sometimes touch them up a bit with a hook file.
I use braid to a leader and I set the hook hard.
Most of the commercially available Ned heads have sub-par hooks.