Both are popular, long lasting shounen franchises that are still airing new material in 2017. Both anime balance boast a fine blend of comedy and action, with the main characters sharing a few similar traits. For instance it could be said that both Luffy and Goku love food more than anything else- except for the lives of their friends/nakama.
Toei Animation handles both series.
At first you might struggle to find too much comparison beyond the fact that they are both fighting shounens. However, that's not the case. Hunter x Hunter is a very intelligent anime in its fighting scenes, and so is Dragon Ball Super - which may come as a little bit of a surprise to you.
The physics in the Dragon Ball series is very complex and understanding why things make sense in the Dragon Ball universe is one of the greatest joys of being a Dragon Ball fan. Hunter x Hunter spells things out for you, and Super leaves a lot to the imagination. However, they are both complex in their fighting scenes and power levels. This is the similarity, and this is why I think that if you enjoyed one you will enjoy the other. read more