Best gamemode for you?

I don't know why people want to know other player's favourite gamemodes, but I will put my favourite ones in, and why.

Clockwork/Nutscript Half-Life 2 Roleplay.
It's the reason why I spent most of my time on garry's mod. I do not know why, but I am drawn into these servers and get hooked, especially if its a populated and good server. It also has more mature and more effort-putting players, not to mention, it is actual seriousRP.
I don't understand darkRP-Esque servers having seriousRP in their names, despite the server not being really seriousRP, no-one doing /mes or anything than just spamming mics.
HL2RP also helps you learn writing. I could say that I write fairly long documents sometimes, for things like whitelists and so on, longest application being around four thousand words.