When comparing GamesPress vs Steam Greenlight, the Slant community recommends Steam Greenlight for most people. In the question“What are the best ways to promote an indie game?” Steam Greenlight is ranked 4th while GamesPress is ranked 7th. The most important reason people chose Steam Greenlight is:
The Concepts section of Greenlight allows incomplete projects to be put on display and receive feedback, including mock-voting as if they were full Greenlight submissions. This can be a valuable tool for refining design, presentation and marketing techniques.
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Pros
Pro Instant outreach to tons of outlets
If your submission is accepted, it will automatically be syndicated on Gamasutra, and will most likely be picked up by Kotaku, Joystiq, etc.
Pro Greenlight Concepts section can help get early feedback
The Concepts section of Greenlight allows incomplete projects to be put on display and receive feedback, including mock-voting as if they were full Greenlight submissions. This can be a valuable tool for refining design, presentation and marketing techniques.
Pro The largest and best-known PC distribution service
Steam's user base is over ten times that of the next nearest competitor, making it by far the largest single marketplace.
Cons
Con Registration costs $100
In order to submit games to Greenlight at all, you must first purchase a $100 activation for your Steam account. Note that this does not represent profit for Valve: all proceeds are donated to charity. It is strictly a barrier to entry.
Con Approval process is a competitive market
The Greenlight submissions with the most votes are approved in arbitrary batches, generally 50 to 100 per month. No metric is used other than raw quantity of positive votes.