QA Wolf vs STELA: Which is best for you?

They are very autonomous and are able to develop rigorous test coverage with little guidance, and thoroughly vet bugs before forwarding them to us. While working with them, we've had excellent engagement...none of the delayed back and forth that sometimes characterizes engagements with other firms, nor a flood of valid but low-impact bugs to provide their value.

It's notoriously difficult to setup test in a blockchain environment where each change to the distributed ledger is immutable, and can be very cumbersome to create & maintain those tests.