Good question. This was a hard question for us last year and we chose SSPL for the time being as a early stage startup to offer some protection. AGPL allows anyone to deploy your system and re-sell it, but SSPL requires the person to open source their additions that they make for their platform, which benefits the project itself.
*Caveat*: This is super nuanced and hotly debated, so this is high level and no perfect answer here.
Mid term, we plan to move from SSPL to a more open license in the future as we further develop our open source project.