YGOPro is developed by Argon.Sun/Flourohydride. YGOPro Percy is a version that is modded in many ways to make it better. DevPro is a Mod of Percy given to a group that develops a Launcher for start much like the first flavor, it is distrubed with DevPro software which connects to a different type of server. YGOPro Percy has an intergrated launcher while DevPro has an external server. They aren't competitors, just divergences.
Both are of good quality but the layout is different. I would say its just personal preference. Some are good using that while others are feeling more comfortable with the other.
DOWNLOAD YGOProStep 1:
Step 2:
Step 3:
Step 4:
When the download is complete you have to EXTRACT it.
EXTRACT the files by using WINRAR or 7ZIP directly to your desktop.
This is the easiest way.
downloadlink WINRAR:
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http://download.cnet.com/WinRAR-32-bit/3000-2250_4-10007677.htmldownloadlink 7ZIP:
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http://www.7-zip.org/Step 5:
Open the map on your desktop and doubleclick " ygopro_vs "
Now you enter the gamescreen and you are able to see the menu
with different options. Explore each by yourself because its really simple!