Like others have mentioned, it's hard to know which approach in each of your examples is best without digging in more. Assuming his approach is indeed better t

Like others have mentioned, it's hard to know which approach in each of your examples is best without digging in more. Assuming his approach is indeed better than yours, what I'd be worried about is that he hasn't explained to you why his approach is better (or you weren't listening). A good mentor needs to not only be able to do things the "right way" but also articulate in an easy to digest manner what makes it the right way. You need to express your desire to learn from him and ask him to explain why his approach is better. If he can do that well, then he'll be a good mentor for you. If not, then not.