The P3 4K is similar to the cheapest Standard - but has a 4K camera - assume it's the same as the Pro.
The big difference is the control and video feed are using wifi and have significantly less range (like less than half) than the Pro or Advanced, which use a more robust system called Lightbridge. 
Unless you only want to operate at close range more or less in plain sight you'll regret getting the wifi link versions.