i think analog design is good. for analog design engineer the ex[erience is important, so you will do better and better. for digital design engineer, you will study new technoligy continuoursly because digital update so rapid. with time going on, you will do more and more difficutly.
I have no idea what's the salary difference between an analog and digital designer.
However, I know that analog design is harder than digital design. If you love a good challenge, be an analog designer.