A hard choice

Yesterday I got my second (and I hope the last) interview for a job as a shopping assistant in a department store where electronic devices are sold. In my opinion it's not a nice job especially because I should need to work every sunday and saturday Saturday and Sunday for the rest of my life and I would not have time to see my wife anymore during the weekend.
Besides Aside from this, another company is offering me another opportunity but, in this case, the pay is not so safe as secure because I should would be selling solar pannels on a commision basis. and If I didnt't don't sell anything, I would will not make any money.
However this job is much better than the first but I don't know what which to choose.