I personally went with the M2 for waterfowl, upland bird and clays. I picked up a closeout M2 Field at Sportsmans Warehouse for $899 a few weeks back. COULD NOT pass it up. I was originally leaning towards the SBE II, but I don't like getting hit hard, so I avoid 3 1/2s like the plague (Not to mention the cheapest I could find one was in the $1250 neighborhood). Additionally, it was my understanding that the M2 will cycle lighter target loads better than the SBE II. I did hear that the SBE II will cycle faster, but I don't know if there is any validity to that, or more importantly, any real world necessity. All that sent me running for the M2, but it also fit my personal needs like a glove. If your a light load, 3" or smaller wimp like me, go with the M2. If you have the need or desire for recoil and don't shoot much clay, go with the SBE II. For their intended purposes, either one will be a fantastic gun, and I personally cannot not outperform either one.