It really depends on you....
We like the LOS pass. Right on our room key, only one card to carry, bill everything to the room. We like knowing that we can pop into the parks for dinner and - once we make the committment - its a done deal. No worrying about losing the hoppers between one trip and the next. Money (at least at that level) isn't a problem for us - so if we burn a day of length of stay pass sitting by the hotel pool or in the room with a sick kid - well, that's life. And since we are one week every other year people, an AP makes no sense..... In future trips, when we have a day at SeaWorld or Universal planned or a day on the golf course, LOS passes will make less sense, and we will have hoppers.
Other people use APs. The go into the parks more than eight days a year and love the flexibility. If we went that often, we'd get APs. As mentioned, a lot of DVCers plan every year trips, but time their trips to be 50 or 51 weeks apart - two years worth of trips on one AP!
Still others buy hoppers. Some of the resellers offer discounts (check the budget board or mousesavers). They might get two weeks of stay out of one seven day UPH - seven full park days in two trips, and water park days, hotel pool days, DTD days, outlet mall days, Universal Studio or SeaWorld days. Great for people who aren't going into the Disney parks every day on their trip - and won't do eight Disney park days in a year. I think hoppers take a little more organization and planning. You need to make sure your dinner at Le Cellier doesn't fall on a pool day - or be unconcerned about "blowing through" a day on your hopper just for dinner. And you can't lose the darn things from one trip to the next. But they are probably the best deal for the value aware.
There are even some DVCers who go without buying park passes at all! The go down and see other Orlando area attractions, play a little golf, go out to dinner at the hotels, go dancing.