Reddit is a collection of communities, not a single publication. That is the whole point. A promoted post inside the right subreddit can reach people who already discuss your problem, in a place they trust. The same ad in the wrong community can be ignored, mocked or removed.
Reddit Ads sits inside that dynamic. It offers promoted posts and other formats across the platform, with targeting by community and interest. It can work unusually well for products that have a genuine community angle. It also requires a different creative instinct: ads that look like ads tend to struggle.
RoketAd is a different model. It is a curated advertising network for indie software, placing ads across independent tech sites, newsletters, directories and tools. You are not entering a community. You are buying context next to content.
The choice is between community-native reach and a simpler, category-based network buy.