Take a look at www.weldreality.com
The fellow who runs that site has some strong opinions on GMAW-P and some very good advice on GMAW process control and selection.
Your question is far too vague for anybody to give you advice.
Are you welding plain carbon steel? what thickness?
Are you welding aluminum? do you have a spool gun?
Are you welding stainless steel... ?
What type of GMAW pulse power supply and equipment do you currently have access to? Older pulse machines are virtually worthless for anything. Some slightly newer ones are suitable for stainless steel and aluminum alloys.
The newest (Miller 350-P and Lincoln powerwave) are pretty good for manual GMAW-P with Steel, Stainless and Aluminum.... But they all still have issues with high speed automation.
If your just doing plain carbon steel sheetmetal than GMAW short circuit equipment costs about 1/3 of what a pulsed power supply will run.
Lots to consider... Tell us more about your own situation and you will get a flood of answers