Thats a question that only you can answer, It all depends on finding the right Employee or Partner, a Dliemna we all face at some stage, dissapointments are Guaranteed!.
Have you or for that fact other Forum members never thought of working together with another self-employed WC, you could then help each other out, ie. when you are on Holiday or need help on bigger contracts, just split the money 50/50 on each Job done together.
If you find some one who is willing to pay for a stake in your Company, what are you going to do if he isnt as quick or conscienscous enought as you ?. Arguments are going to happen, youd need to think of all these possibilities and make a water tight contract, an Employee wont have any say in how you work, hes only interested in his wage, but beware if he eventually goes it alone and steals some of your customers.
I think it boils down to the fact who will you be able to trust most and who wont let you down.
Terry