I play regularly with a number of different partners: half SA, half 2/1. I am comfortable in both systems, and recognize that some bidding situations favor SA while others favor 2/1. But I cannot seem to find a detailed, point-by-point discussion of this among the experts or even among good players I know. What I find instead is this: the SA players acknowledge value in both systems but are reluctant to change as they are happy with what they know ... and the 2/1 players, unfortunately, are dismissive or worse and typically refuse to even entertain the question. P.S. EDITED to say Thank You to everyone who has responded so far and to clarify that when I say SA vs 2/1 I mean strictly that: a 2/1 response means GF not just 10+, and 1M/1N is forcing, irrespective of conventions like inv. minor, NMF, 4SGF, Bergen, Drury, DONT (et al), Michaels, U2N, RKC, cuebid, and the rest. I did not realize that some players associate SA with "plays very few conventions" and 2/1 with "plays lots of 'em." As mentioned, I play both SA and 2/1 but will acknowledge a preference for the former, as on the whole I find it provides more flexibility to describe intermediate hands, AKA, "Sometimes your best contract is 2N." I also, as mentioned, have been turned off by the dismissive attitude of more than a few 2/1 players - typically those who never learned SA - and find myself mumbling "Good grief, sometimes this sounds like a cult."
