What is more important for any early-stage startup?

Definitely MRR

Early adopters are really important as they help us make the product market fit.

product market fit.

Validation of an idea is the most important thing for any early-stage startup. You should validate your idea before building a product or a prototype.

The most important factor for any early stage startup is the team. The team is the foundation of your business. Not only it will help you get things done, but it will also make sure that you don't stray from the original plan and keep your company on the right direction.