The choice of a price plan depends on requirements for software, technical experts' recommendations, and the VDS purpose. General recommendations:
SSD-2 and SSD-3 will suit you if you need to order a VPS Windows at a low cost and use it as a test platform, or it will be perfect as a test platform for hosting medium-sized low-traffic websites or apps.
SSD-4, SSD-5, and SSD-6 are universal price plans for organizing the workplace, launching 1C: Enterprise/Accounting, uploading a large number of websites or high-traffic websites, for instance, online stores.
SSD-7 and SSD-8 rate plans are perfect for projects with special reliability and performance requirements (government agencies and financial institutions).