It's a tricky decision to make isn't it

I had a business 4 yrs ago and employed 10 staff, turnover was great, profit was good, but what a headache! Staff can be great don't get me wrong, BUT at the end of the day, nobody is going to be a thorough as you as it's not their business. At the end of a working day they go home and forget all about it, have no concept of how much effort goes into running a successful business, very nice! if you want that.
I was at the same point that you are at, with this decision to make, it seems to me you have to decide whether you can or want to deal with all the extra legalities and problems of having staff, or would prefer the simpler life, running and doing the majority of the work yourself. I chose not to employ as i don't want to take the risk of staff killing my business or deceiving me further down the road by nicking work, i know this cannot apply to all staff, but i'm happier knowing that i'm in complete control!! You can still achieve good wages and a saleable business with one van, as it's obvious to increase your prices and only take on lucrative work.
Of course there are pros and cons with each option, and it's down to the individual to decide if they can manage staff effectively and reep the rewards! I have learnt from my past experiences i'm not particularly great with staff! hence the tribunals i ended up in! :

all a learning curve, but i'd rather give it a miss! Good luck with the decision though.