I have used Oxygen as well. Compared to most of the page builders that I have used this has a little longer learning curve. However, this a very good one and no-nonsense page builders. You will take time to get going if this is your first time if with page builders. Though oxygen is not typically called page builder but called theme builder.
As mentioned earlier, it's very good, and once you get a hang of it you will feel that all others out there are crap. At least that's what the Oxygen community feels. Since you are starting out now, if I were given an option I would certainly start with Oxygen.
What you can try doing now is to install 2 dummy local websites and then install oxygen and elementor on each of these to try it for yourself. Also, another recommendation that I have for you is check from youtube videos and go-ahead to take your decision.
All the best.