What should I learn, mandarin or Japanese

hello there,
I am actually new here to this form. And I am taking some mandarin class with a teacher online, but I find it so difficult, so I am reconsidering to change maybe into Japanese.
For me to learn a new language is just a have improvement. But I hope to get some ideas if anyone who is learning mandarin or Japanese can give me some ideas? Should I keep learning mandarin or try Japanese, I know it may not make any sense, but I still would love to hear some ideas.