I like Arch. So I like Arch on the RPi too. The benefit of Arch is that it's
really simple where simple means no layers of abstraction added on top of things, no configuration tools, everything is as vanilla as possible. Which makes configuring it a breeze
once you know what you're doing.
The Wiki is great.
If that doesn't appeal then yeah, go with Raspian. It's based on Debian so it's super-solid and very widely used, has tonnes of packages and there's plenty of info out there.