Which is good for mobile app launch? Capecitor or Flutter?

Hey everyone!

Currently I am building an AI Psychologist tool where you can understand about your mind, and also I have build so many tools but I am confused that I should build it a website or mobile app.

Actually, I am building a SaaS product so which is perfect for me? If I build it a mobile app so is Capecitor good or I should go with Flutter?

Please tell me which is better and why. Otherwise website it perfect?