Relative to content per (whatever unit of measurement you want) I thought Fallout 4 pretty much nailed it. It still had open swamps and forests to explore but there was always something interesting nearby. You usually had a pick of landmarks you could head toward. If you ventured into the city or a few other areas then you could literally see different enemies to fight just by turning in a circle. In fact, this led me to discover that I really, really love instigating different factions into killing one another. For me, it made it a lot more fun game than Skyrim or New Vegas in terms of just wandering around, which is the reason I play these types of games in the first place.

All I know is large and spread thin isnt the way.....
Small and packed might not be great either, but its def. better than Large and spread thin.

I prefer a bit of both like the witcher 3.

I prefer the middle ground. A size like Skyrim or Witcher 3 is usually what I'd look for in a world with content strewn about.

I prefer linear games myself over open world titles, so with that I prefer smaller maps that are much more packed.

If I had to choose between a medium sized map with 300 things to do and a massive map with 300 things to do, I think I'd pick the massive one for immersion.

As a huge platforming fan, I prefer small, dense maps. However, I’m open-minded and as long as the concept is done well, I’ve got no qualms with a large map.