Currently it seems space as an environment is not suitable for humans due to heavy radiation. Massive shielding needed. Also, from a psychological point of view

Currently it seems space as an environment is not suitable for humans due to heavy radiation. Massive shielding needed. Also, from a psychological point of view - would you rather have your grandchildren stuck in cramped sodacans in space or colonizing a new world with a sky and mountains and other goodies. A planet based colony is probably a lot more resilient than a space based one. I have no opinion as such towards one or another.