At face value Bunny and Zuora are very similar which is great as it makes it easier to migrate without a loss in functionality. 

The biggest challenge with Zuora is the lengthy and complex implementation times with large professional services contracts attached.

The key differences between Bunny and Zuora go back to the foundations of the respective products. Zuora was founded in 2007 which was very early in the SaaS revolution, they had a good product for managing subscriptions at the time but as the industry has evolved, they have become bloated and hard to use. This is due to trends like supporting usage-based billing and the addition of quoting tools and has resulted in a product that has a minimum implementation time spanning months. 

On the other hand Bunny was founded in 2022 by a team of SaaS veterans that have experienced the pain of scaling from zero to millions of dollars of revenue. The team at Bunny have the benefit of watching the evolution of the SaaS industry and building a product that is far easier to use and 10x quicker to implement than Zuora. 

As they say in the SaaS industry, friend don't let friends use Zuora.