It is better to stay on the company that you are staying right now, once you threat them to resign possibly they will going to offer a quite much higher salary rate for the new employee who acquire from your position. During probationary period of your employment expect a low salary rate pay but once they see you that you are performing your job different from the past employee whose in your position before a possibility to increase double or triple from what you are expecting. But, do not expect the same way too because there are some company didn't raise your salary and fail in return after your probationary period. A good decision-making is depends upon the situation..

It is better to stay at the company that you are with right now, once you threaten them with the possibility of resignation they will offer a much higher salary rate for the new employee who they acquired from your position. 

During probationary period of your employment expect a low salary rate pay but once they see you that you are performing your job differently from the past employee, who was in your position before, there will be a possibility to increase by double or triple from what you are expecting. 

But, do not expect the same way too because there are some companies who don't raise your salary and fail in return after your probationary period. A good decision-making is dependant upon the situation.