What are the advantages of buying the Steam version vs the version directly from the website?

From a refund perspective, I suppose it's personal preference.

A game like civ V that has a 6 hour tutorial, steams refund policy is going to screw over the consumer.

Then there's a situation like me buying Chivalry. Took me 2 months to start it for the first time. Played it for an hour, didn't like it.

From a price perspective, Humble is usually cheaper but steam offers a better sale price once in a while.

 

That's a good point

I guess both methods have their pros and cons.

 

Well I don't think I'll be wanting a refund on this game so that's the least of my concerns.

 

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Alright

Pros of Humble bundle: Cheaper, Can save older versions of the game, Has better refund policy, Includes a steam key, which you can use to get automatic updates
Cons of Humble bundle: No automatic updates on the DRM free version

Pros of Steam: Automatic updates
Cons of steam: More expensive, can't save old versions
They both offer the exact same game with the exact same content

I would get Humble bundle but its ultimately up to you.