Prism Microworks or PDQ Signature Systems

I have been researching POS systems for about a year now. Have it narrowed down to these 2. I'm having trouble pulling the trigger and making a decision. I would appreciate any input from anyone who has had experience with these companies. I know a POS will help my business out tremendously. I'm just very worried about making the wrong decision. I've been in business 25 years and this is the most difficult thing I've ever had to decide on. HELP!!!
Thanks in advance,
Mike