I have had a few photographers ask me what is different about the Godox AD Pro lights, well Godox answered it pretty clearly on their Facebook page. They also posted a tutorial for the AD200Pro which you can view above.
the AD200Pro has enhanced features as follows:
Stable color temperature mode is added to assure ±100K color temperature tolerance over the entire power range;
Quicker recycle time approx. 0.01-1.8s;
The more precise power output of AD200Pro: 9 steps:1/256-1/1, in 0.1 stop increment;
Shorter flash duration t0.1 of AD200Pro:
Fresnel Head:1/220 to 1/15380 seconds
Bare Bulb Head: 1/220 to 1/13510 seconds;
Upgraded flash holder for easier & more stable installation;
HD VA Screen with Clearer Display Effect;
Two function buttons are added on the function panel to easily and quickly shift to Modeling Light Mode and High-Speed Sync Mode.
Below are a variety of reviews and it sounds like Godox is on a roll. They are offering some incredible value and performance for the price.
Godox AD200Pro Witstro: B&H Photo / Adorama
Godox AD200: B&H Photo / Amazon
Godox AD400Pro Witstro: B&H Photo / Amazon / Adorama
Godox AD600Pro Witstro: B&H Photo / Amazon