Arrow functions provide lexical this and cleaner syntax but can cause performance overhead in certain scenarios and are not suitable for methods that need dynamic this. Regular functions with explicit binding offer more flexibility but increase boilerplate.
Arrow functions simplify code by automatically capturing this from the surrounding scope, reducing this-related bugs and eliminating the need for .bind() calls. However, they are not ideal for prototype methods (where dynamic this is needed), and using them in classes (as class fields) creates per-instance functions, potentially increasing memory usage. Regular functions with explicit binding provide more control and are better suited for prototype methods or when you need to leverage call/apply/bind. The trade-off is between convenience and flexibility/memory efficiency.