Advice needed,

When i left school use to go to gym and was in decent shape but like most people stopped going and got fat lol , a couple of years ago i did about 6 months weight training at home and was happy with the results (3 or 4 days a week) Since going back to my old job this has stopped and i have put weight back on

Problem is the only chance i get to exercise is the weekend by which time i think theres no point, Is it worth weight training just at the weekend? or would i be better off taking up jogging etc? Im thinking i should go cardio to lose between 1 and 2 stone then switching back to weights? just dont want to waste my weekends on the weights if its not really enough

Thanks for any advise sorry about the essay and i Honestly have virtually no spare time during week