If you try to build a funded company in a space that can't sustain one you will struggle, likewise if you try to build a small bootstrapped company in a space that can you will similarly struggle.
If your direct competitors have a much better product then you (because they have more dev/product/ux resources than you), a professional sales org, marketing machine, etc. then it's very hard to compete. Your acquisition costs and churn will be high which will severely hurt your ability to grow to a sustainable level.
There are some ways to compete by going after the customers your competitors don't want (if they're price sensitive, too small, wanting unusual customization, services, niche needs, etc.) but you should think about upfront what your strategy is going to be.