Easiest for me is DTV, push a button and it will setup and record in HD based on the prior recording settings or switch to any channel. Past and future channels to watch as desired. A standard recorded 1 hour show is watched in 30 minutes skipping the ads.
Just about every RV comes with a TV antenna. That's got to be the easiest in my opinion. Best? That depends on what you want to watch I guess. I always enjoyed scanning around to see what channels I could pick up from a new location. The local news, different sports teams, etc.