Just realize that the Workmaster is an
economy tractor. (so is the JD 5055e) It does not have the same features, driveline, etc., as the T4020 or T4030. For instance, the WM has a gear reduction final drive and smaller lift arms. It does not have the same 3ph capacity as the T series. The transmission is different, the clutch is different, the T series has better hydraulics, the T4020 weighs over a ton more than the WM, etc, etc, etc.
If you really want a NH, I would suggest that you look hard at the T series.
Here's the NH specs for both tractors. Look for yourself. Then compare them side-by-side at the dealer.
Agricultural-Tractors New Holland Workmaster - Models, technical data and characteristics
Agricultural-Tractors New Holland T4000 - Models, technical data and characteristics
BTW, I have a TN70A. (basically, same tractor as the T4030) And, it's a great machine. Love it. I put about 200 hours per year on it. I wouldn't even consider a WM, myself.