I shoot my XDM 5.25 in Limited minor every year at the Monster Match, and I can still hold my own against the major PF and fancy all-steel guns. The rest of the year I shoot Production.
As for the OP, think of what Division we generally steer newbies: Limited. Limited can be both the easier, less stressful Division and at the same time be the most difficult. Easier for the less competitive shooters because reloads are less frequent with most modern double stacks, and equipment restrictions are minimal. More difficult for the competitive shooters because of the wider range of equipment brought to bear by your fellow Division competitors. Limited arguably has the widest range of gun and equipment options next to Open, but you have to stick with iron sights and no recoil reduction options. Production guns, by design of the Division, are essentially the same and equipment restrictions put most people on the same level field. We Production shooters are often playing a different game than the Open and Limited shooters, as are the poor souls subjecting themselves to Revolver