I believe Web development is better area as it has a lot of room for growing while in networking a junior can easily reach to your level or at least to the level where he/she can do satisfactory work, which is also the reason web developers are paid better as well.
On the other hand, there are many opportunities for a web developer such as more job openings are of web development as compare to networking. Each company has many web developers while networking personnel is very few 1 or 2. Apart from all those benefits you can also learn different technologies for increasing your worth as you grow senior.
Hope it helps!!