I assume you are asking as a O/O. A knowing, speaking relationship with a smaller company is better than a computer driven relatioship with a larger company where you are just a voice in the crowd. Talk to them. Ask for specific examples of solo O/O load activity. If you are supplying primary insurance, make sure you are getting paid for it. Make sure there is a regular pay schedule. Make sure someone who can and will make a decision is always available. What source do they use to figure miles? I have talked to quite a few companys and would reccemend PTLLC, DeMaris Transportation, On-time Express, and Diamond Delivery. Others that seem to have a good reputation are Expressway Inc. and Daystar Trucking.
Good Luck!