Hey,

Both career are good, and in both of them you can make money, because salary depends upon your knowledge, your work, your task, your com pany,etc.Because  employees with same task or role may also have difference in their salary ,the reason can be different company,knowledge, etc. If you dedicates yourself in one direction with your full potential you will be able to achieve your dream . But yes you can compare both on bases of availability of job in market as a freshers, so digital marketing is a highly growing industry and you can easily get job in it ,.

and also it depends upon your personality, of you are a extrovert person with able to expression you idea , and if have pursuing skill go for digital marketing.