It all really depends on the dog. My guy sets out to destroy toys as his entertainment. If they squeak he'll enjoy that for a short time then it's time to get serious and start the destruction (if I let him). I got him a toughie of the highest strength and did a lot of taking it away, giving it back (practicing 'drop it' mostly), taking it away again and throwing it to extend it's 'life.' Still only lasted about 3 cumulative hours with him before it had to be trashed for safety.
Really the only stuffed type toys that have a chance to last with him are the ones I don't allow him to gnaw on. I have a few we use for indoor fetch and he'll chew and squeak it as he's fetching but has to drop it in front of me or the game is over and the toy is put away. I recently got a kong wubba that is treated the same as the stuffed toys. He COULD chew the kong squeaking part to his hearts content but he'll only do that for a bit then start to gnaw with his back teeth on the fabric strips on the end. He managed to gnaw about a quarter of the way through two strips before I noticed he was doing so.
So far his
Kong Squeezz is holding out really well but he's also mostly lost interest in it too. He had a blast and we played about 45 minutes straight fetch, tug, and just chewing on it when I first got it. Now he doesn't really care. But his Cuz is also still in good condition too.
If your dogs just like tough balls to chew on I have to recommend
chuck-it ultra balls I got Jubel a set of two shortly after I got him and they have stood up to his chewing power for almost 2 years now.
I've heard good things about the goughnuts but I don't think Jubel would be interested in it for very long if at all so I haven't bothered to try it out myself.