I think it's where do you want your stress.
I've had 1 man out in his own van and I've worked 2 man and of course solo.
All of them can be stressfull, I hated having a guy out in his own, he never hit target and all the extra work and admin on top of being out myself all day was too much hassle.
2 in a van was easier but then you are still stuck with someone all day, awkward when you need a dump. Not just that but it's not efficient at times and of course they would ring in sick and leave you trying to do 40 jobs on your own.
Being solo is cool, for about 3 days a week. Problem with solo is it gets boring and knackering when you are busting a gut 5 days a week. It's not sustainable to work flat out all the time an inevitably you slack off.
I don't particularly like any way of working, it's all work at the end of the day.