I would be happy with either approach; they both offer their own benefits.
I did Lighterlife in the past and quite enjoyed being in a group. I used to go on a Tuesday evening straight after work and I was then more office based, so I would get lots of encouragement from my colleagues as I headed off to LL. The LL counsellor used to do a group on a Sunday afternoon which I wasn't part of but I did think at the time that a group like that could have been a lifeline to people too busy during the week, but also people that felt isolated - maybe because they were new to London, recently separated or bereaved etc.
Just a thought?!