I am getting ready to get into tow truck business and I need some advice. Which one is a better deal to start with wrecker or flatbed? I am in Washington State 
Hello and welcome to the site.
As to the type of truck.. what type of towing are you going to be doing?
As I believe Fate is alluding to... It's hard if not impossible perform some recoveries with a flatbed. If you intend to perform accident recoveries and winch jobs as well as towing, your truck should be a conventional.