I've found that the "Azure Storage" services (blob, queues, table) are pretty decent (for what they are). If you don't have huge throughput or size needs that is. Different beasts, but definitely useful imho.

If I need really high load/throughput, I'd probably reach for Cassandra on DO for best bang for the buck. YMMV though, and not too big on Cassandra unless you really need it.