In both series the main characters have very similar personalities. Both series there is a kid aiming for the top in Pokemon defeating the pokemon league and in Hikaru no Go trying to become the best Go player.
We all know Pokémon and Digimon, right? They are both very great shows, which a lot of people enjoyed in their childhood. Now both of them are back, with new seasons which debuted in 2010. New characters, new designs and a new storyline. If you're new to one of the series, then I would recommend the other one. You don't have to watch the first seasons to keep up with the storyline. Digimon and Pokémon both envolve children with monsters who are battling.