Ask HN: Should I take Senior Mobile Engineer or Junior Web Engineer?

I am junior mobile engineer (Android) in one of largest Startup in my country for one year. This is my first job after I graduated from college. I take the junior mobile engineer role because that was the only software engineering field which i'm confident at the time. 4 months ago I was interested in web front-end engineering and started to learn ReactJS.

After one year working here, I started to think to resign and continue my career in another company because there's shifting in management level and directed the company's vision I couldn't no longer follow. Meanwhile, I fell bored with Android engineering because not much i can learned here. Then, I found two job opening which I'm interested at, one is senior mobile (Android) engineer and the second is web front-end engineer (ReactJS).

My question is, should I continue my career as a senior mobile engineer which is the field i'm currently have confident in (and got salary increment), or as web front-end engineer one (which required me to learned from the start)?

Based from current state of both Mobile (Android) and Web front-end (ReactJS), which one I should take?