I wrote and produced some songs that I used in videos (that I also wrote and produced). I now want to distribute them on common outlets, especially Spotify and iTunes Store. Spotify has a list of many distributors and publishers with different clauses (e.g., upfront fee and commission). I want to administer and manager all rights other than the distribution of the assets to the final user; e.g., I don't want the distributor to decide whether these songs appear in commercials or other videos (synchronization license).
I know that recommendations are normally off-topic for StackExchange sites. Where can I ask for recommendations regarding distributors and to learn from other people's experience?