The best language/ecosystem to use is the one you are most familiar with, most productive in, and able to be the most connected with. If you are an experienced

The best language/ecosystem to use is the one you are most familiar with, most productive in, and able to be the most connected with. If you are an experienced .NET developer, I'd encourage you to start there. Don't try to build a new SaaS application while learning a new language and ecosystem; that would amplify the amount of work you'll be doing!