Depends on what you mean by "running". A rugby 7s game probably has a greater proportion of flat-out sprinting, but a game only lasts 14 minutes. A soccer match will last 90 minutes and the players will cover something like 15K over the course of that 90 minutes, so obviously they are going to cover more ground. So: Intensity -- Rugby 7s. Ground covered -- soccer.

ive played both and for shure rugby 7s it has at least twice the running of soccer

Depends what type of running. Rugby 7's is very sprinter work. It's short but hard work and there are no breaks to rest. Soccer is a lot more long distance endurance. It depends what you going for. I prefer physically demanding exercises which is why I choose rugby(15s) over soccer and rugby 7s.

well both have a lot of running but I would say 7's rugby. but that is just my opinion

Rugby 7's I guess. The original 15's is already a game multiple burst of sprinting and with only 7 man on either team there's more running than contact.

Soccer