Are you actually serious about wanting to get better? To the point where you could play in tournaments for example.
It sounds like you are not, because you don't want to learn openings. But it annoys you that other people in the company are better than you. How much does it annoy you? How much work are you prepared to put in?
Just asking a casual question about whether it is better to attack or defend won't do it. Attacking is more fun, and that might be as far as you want to take it. Serious players will have personal styles and preferences, but will know that attacks must be prepared. That means understanding openings. If you are very serious you will need to learn them. If you are less serious you will need to know some general ideas, such as what is a weakness.
If you have only been playing for a month you don't know yet how important chess may be to you. Play a bit more. Have fun. If you find that you do want to work a bit, you will probably be able to think of a better question.