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If there ever was, it's probably either TF2, Counter-strike, or Counter-strike Source. Especially since the Counter-strike series is one of the oldest and longest running PC franchises in existence, and it's what this website was originally made for.
That said, most of FNF's submissions are spam, so I wouldn't consider that record totally genuine. It does however show just how popular this new game has gotten.
Beware that modding Source and GoldSrc engine games takes a lot more effort and technical knowledge than modding HaxeFlixel. It uses a lot of ancient tech from like 30 years ago plus a lot of pre-baked assets that need compiling, which complicates things. If you plan on modding CS:GO, TF2, CS:S, or CS 1.6, then the Valve Developer Wiki is probably where you should get most of your information. Reverend V92 can also help you but he's not active on this site anymore, his Twitter is probably the easiest way to ask him for help.
You should get into Source engine modding if you ever get the chance, there's a lot of neat stuff you can make.