what will your customers want in 2020?
It sounds like you don't refresh your software too often, so you need to consider what your customers will want in 2020. If you don't have a crystal ball, you need to keep your options open.
Unless you have an overwhelming reason, choose a platform - any platform - that doesn't tie you to a specific vendor or operating system on the client, app server or database server. For me - and I'm a business bloke rather than a techie - that rules out most of the Microsoft tools.
Biting the hand that feeds IT
