Using the OTP and RSA compared to only using the OTP itself
It depends on what you would use the RSA algorithm for since a one-time pad (assuming you implement it correctly) should achieve perfect secrecy, which means its ciphertext cannot be cracked. RSA is one of the first public-key cryptosystems that can also be considered as secure when you are using large enough primes.

So to answer your question, it cannot be more secure than using OTP only since it simply provides the perfect secrecy. But OTP does have its limitations and that's why we have other encryption schemes and algorithms so that we can choose the most suitable one in different situations.