When starting out with mobile apps i always wonder if it pays off to invest heavily in something like this (i love C#) or put my money on web-tech based apps es

When starting out with mobile apps i always wonder if it pays off to invest heavily in something like this (i love C#) or put my money on web-tech based apps especially if looking at it mid/long term. I know web-tech isnt there yet, but its not far off. What do you think ?