So, which one of the pricing models is right for your business? It depends on several factors, and the size of a software project is surely not one of them. You may address a Drupal development services company to build a business website (which, logically, should be a Fixed Price contract) and end up making a hundred change requests related to UI/UX design. There are seemingly complex projects which involve IoT technologies or integrations with new or close source APIs; yet, a customer has tech background and a SRS up his sleeve, so going FP still makes sense. Don’t jump to conclusions; address a reliable vendor and take the time to analyze project requirements instead!Also, take a look at this article
https://steelkiwi.com/blog/comparing...and-milestone/