What is the definition of a better Muslim?

In brief we can say that, a Muslim is the one who has committed himself openly to submit himself to Allah. It is the commitment. A good Muslim will then be the one who fulfills that commitment and acts upon the statement that he or she made concerning themselves in the relationship to Allah. And as such, an adept Muslim will safeguard himself /herself and try to see how s/he may improve their practice of Islam. So becoming an adept Muslim fundamentally involves improvement on the basic practices of Islam that is required from us.