In this situation the details are actually important. What 2 technologies are being used? Can you cross-train? can you hire more dev's on tech A? Which platform is more sustainable, scalable? What is the pool of talent in your regional area? Are you in the enterprise market or consumer market? Are you integrating with your clients via some kind of API or is it a SaaS model?
All these questions impact your decision. It seems like you are only thinking about the technology but if you are a technology company then choice of platform has wider impacts.
All these questions impact your decision. It seems like you are only thinking about the technology but if you are a technology company then choice of platform has wider impacts.