There's almost nothing to compare between the two. You'll get more info by watching videos, or just asking about specific topics here.

As for building and enemies, they love to try and bother you. If you stick to the meadows, your average enemy isn't a threat, though tougher foes appear at night, and which enemies can show up depends on your progress through the game. The game can also send raids to try and destroy you and your home at almost any time.

To be able to build more peacefully, you can set up walls all around the perimeter of your land, and place certain structures that disable enemies from spawning within their radius. At that point, building is pretty relaxing unless a raid happens.

And an upcoming update (ETA still unknown) looks like it will have options to disable raids entirely, as well as many other customization options