PostHog brings a whole toolbox of things one needs when running an early stage business - all with a generous free tier so one can really experience the product before switching to a paid plan. That they're OSS also gives me the peace of mind that i can self host if things go bad. Their SDK is easy to add, and they have a comprehensive API should you want to automate things further.

Fair Pricing and product / campany language/marketing

Outbounds integration and flexibility in data ingestion. Super easy dashboard Mobile SDK is very simple and even if we found a crash they solved in less than 24h