There are basically three options for a shotgun, right?
1) M2 + mods for dual/quad loads + 14 rd tube: Extremely reliable, minimal cleaning required, and competitive in all three divisions.
2) Cheaper than M2 tube shotgun of the moment (FN SLP, JM930, Versamax, A5, M3K, JM940, 1301,...): May work depending on your proclivity towards maintenance, the environment, and luck of the draw.
3) Mag fed gun: Spend a little. Spend a lot. Modify it. It is still going to jam.