I would tell for both of them, its your choice at last.
If you immediately take Masters now, then you finish your studies in a single stretch and have higher package compared to others, but If you take masters after an year of work, you have experience working on some project or product, so you have more experience before studying masters.
If the company or the business you have got a chance to work has good and known reputation then, you would get twice the benefit and also recommendation before studying masters and of course, the con is that you lose your touch to study for a period of time.
The same goes for masters. if you got admission into good known university, then masters is better.
Hope this helps you.