The down side of a long gun, whether flint or cap, is that the stock is pinned to the barrel. The barrel actually supports the stock. This makes it more time consuming to clean as it takes many patches to do the job. A patent breach, think Hawken short stock, is much easier as you pull the wedge, unhook the barrel, and put the breach end in a sink of hot soapy water. Then just run the patch back and forth until the water comes clean through the nipple or touch hole.
I built both a .32 cal squirrel gun and a chief's grade trade gun in the eighties, both with Siler flint locks but don't shoot them nearly as much as I did my first which was a Thompson Hawken kit.