As stated above, the SXS will always be lighter.
I started with a SXS, owned some pumps, auto's and OU's over the years, but now that I'm slowing down I do 90% of my hunting with a Merkel 20ga (26" tubes).
I still have a 16ga Rizzini OU that fits me like a glove and weighs nothing but the Merkel's stolen my heart.
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Honorable mention for the Rizzini.
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Good luck.
Hope you find "the one". smile