Oracle seems to be a lot more reliable than Access. Access begins to slow down when the number of users is increased. Depending on your needs for now and in the future, it's your decision. Given the choice, I would pick Oracle every time. Also if you move to QC which you will have to eventually if you stay with Mercury, QC will not work with Access. At least not at this time.
Success is the ability to go from one failure to another with no loss of enthusiasm.
~ Winston Churchill ~