I did online for about 6weeks and I lost a stone but I felt like I was letting bad habits creep in and I don't trust my scales so I joined a group I lost 4lb in my first week, I like having other people to lean on and little texts from my consultant checking on me.
I've just joined online as I don't have the time or inclination to go to group. I live in the middle of nowhere and work full-time. Going to a group would mean an evening group at least 20 mins drive away from home which I don't fancy doing after a day's work.
It's only been two weeks but it seems to be working.