If I am on my own then Pomemon Go is currently much more exciting than Ingress. But I miss i) you can not annoy opponents by blowing up their farms/homeportals, ii) make long bike tours in order to build large fields and iii) meeting with 8+ players and building a nice L8 farm, iv) being involved in continent-wide fielding operations with 100s of other players.

tldr: Pokemon Go is the better single player game, but if you are into large-scale and coordinated multi player games then Ingress is better.