Agree with @mhiltner, it doesn't make sense to compare it with Synapse, as it's literally dead. You most likely want to compare it to Fabric instead. Fabric is highly under development, but IMHO it still lacks behind other Data/AI solutions. No catalog layer (like in unity catalog), no Serverless (in Fabric you pay for idle time) or proper AI tooling (although ML Studio is not bad tool) integration. But this might of course change in the next month.