Comment depends (Score 1) 834
Benefit/not depends on many things:
1) Your values
2) Your employer
3) Your career path
So best to get both, work experience while studying masters, that is. You get also extra points because you look so hard working while doing both same time.
Also, as many people have pointed out, you might benefit a great deal from it later. Check out the management ladder in many companies, many times there are not a single guy without masters degree.