When comparing GOG vs Kinguin, the Slant community recommends GOG for most people. In the question“What are the best online stores to purchase PC games cheaply?” GOG is ranked 2nd while Kinguin is ranked 11th. The most important reason people chose GOG is:
GOG refuses digital rights management on principle.
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Pros
Pro DRM free as a rule
GOG refuses digital rights management on principle.
Pro Seasonal sales
gog features summer and winter sales every year and offer quite a lot of games at lower than retail prices.
Pro Client is completely optional
You can either download games directly from the site or use their Steam-like client, GOG Galaxy.
Pro Occasional free games
Every so often, GOG will have a game listed as free to add to your account.
Pro Money back regional pricing
GOG may charge more in some regions as publishers request so. But in those cases they give the extra cash back as credits for buying another game.
For example, the lowest price for the game is U$20 in US, but if in your region it costs U$30 they will give you U$10 back as credits for your next purchase.
Pro Money-back guarantee
If GOG can't help you fix a game, you're free to refund it within a month of purchase.
Pro Excellent support
Support is handled by an in-house team working for the company, and staff are knowledgable about their platform and games.
Pro Good puzzle games
You can find puzzle games like Superliminal and the Myst Series on this website.
Pro One of the only ways to sell second hand game keys
If you have product keys for games that you don't need, you can sell them on Kinguin. It works similarly to Ebay, but it's a marketplace dedicated to keys.
Pro You build up a little credit per purchase
You get a few cents of credit per purchase you make, if you have a Kinguin account. That can make some difference after a bit.
Pro Usually doesn't get cheaper
Websites like Kinguin and G2A are usually the cheapest way to get game keys. There are tricks like using discount codes for -3%, -5% or even -7% discount. These keys can usually be easily found through a simple Google search or through a Twitch streamer who's partnered with Kinguin. Another trick is not to use the shield service. It's usually a waste of a dollar, given the fact that in reality issues with game keys are rare.
Cons
Con Linux games distributed as installation scripts
Installation scripts have a lot of bugs and dependencies. Packing games in archives would be better. Extracting archives from installation scripts is possible, but difficult.
Con Many games only for windows when they also have a native Linux version
The Linux library on Steam is far bigger than in GoG, many titles have its Linux version both in Steam and its respective web page, but GoG only lets buy the Windows version.
Con No Linux client (yet)
They say it's coming. And meanwhile you can still install Linux compatible games directly.
Con Limited, often dated, library selection
Con No compatible support with (Steam) achievements
Steam has achievements that many appreciate. Unfortunately, those same achievements are not available when you buy the GOG version of the same game.
Con Sellers could possibly be shady
While keys are usually legitimate, there is often no way of telling how these keys were obtained. There are cases in the past where stolen credit card information was used to purchase a bunch of game keys and then those keys would be sold on platforms like this. So in that way it's similar to Ebay as well. However, it may be that it's blown somewhat out of proportion by gaming publishers who would earn more off gamers if they'd buy brand new keys.