I use a lot of Prochem's stuff and Bridgepoint pre-spray. It's hard to beat Prochem, but their pre-spray has changed quite a bit in the last couple of years. I used to use ultrapac but now it foams quite a bit and costs a lot more.
Prochem seems to have the best products for spoting but a little bit expensive. Pros choice does a good job and has very good instructions on the container, but there performance is not consistant.
I do not have a problem with consistency from Pro's Choice, but many of thier products will most likely be banned shortly due to restrictions on chemicals. They must be "California Compliant" which I'm told many of the products from P.C. are not. Thier red stain remover is the best I have used so far. I don't use many other products from them.