What's good compared to the board game version:
- can be played in the train or airplane or whatnot, on tablets and smartphones
- you don't need a group of friends around if you have the sudden urge to play the game
In what ways the board game version is superior:
- more socializing, talking, laughter and whatnot
- more content, expansions, special powers, races, the underground version of the game, the version with those global effects, scenarios, team game, creating own maps, more maps, supports up to 6 players (instead of 5 in the digital version), artifacts and holy places
As I have both this version and the board game, I can say that I like both. I got this with the humble bundle, so it was quite cheap. I found so far other players easily, and there are lots of options on how to play the game (on the same tablet with others, against bots, against up to 4 other players). What I really like is even if you have no expansions whatsoever, if you join a game where the hosting person has the expansions, you also have access to them for the duration of the game.
In short: a fun game. If you have a tablet, even more so.