Personally feel that data communication is better! Because data communication still occupies the mainstream position in the market, it is better to study data communication. If you have a chance, you should also learn about optical networks. Because the future development direction is optical network. Add it yourself! I studied optical network, and I learned a lot in Daxiwan. You can go and have a look when you are free. I am currently in Shenyang Telecom Engineering Bureau. Contact when you have time! Go your separate ways!