When comparing GOG vs reddit - GameDeals, the Slant community recommends GOG for most people. In the question“What are the best sites to find PC game sales?” GOG is ranked 4th while reddit - GameDeals is ranked 6th. 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 Collates deals from all over the internet
Find out about a wide range of bundles from a variety of sellers
Pro Easy check for reputability
Rather than trying sellers blind, you can see what the community has to say about both sellers and deals, as well as comments saying if you can get the same options cheaper elsewhere.
Pro Huge list of sales due to crowdsourcing
Due to the large amount of users (355k) this allows for a constant updated list of all the sales on games across the internet and box stores to be listed and updated very frequently.
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 Some sales may be missed
Due to the crowdsourcing some sales may not be caught by the users and posted, so is not a full proof system to catch every sale out there.