Here is some basic homework for you to do, some important questions to be asked and answered in advance, before you make a selection.
Preparation is key; if a buyer or specifier goes in unknowledgeable, there can be a quantum difference between expectations of the system and what it actually delivers. You want to obtain the system that is best for your business – neither too simple to work well, nor so complex that it intimidates your people. Selecting a vendor, getting the system installed, getting it to operate effectively on a day-to-day basis – a lot of problems are inherent here, but problems will be reduced with prior planning.