Usually, I'm using their PFR and steal% to get an idea of how aggressive they might be when opening from the SB. Sometimes, if I have thousands of hands on the player, I'll have a reliable percentage of how often they are opening specifically from the SB, but usually there's not really enough information there to be useful. Mostly I am considering preflop plays here, because there are a wide range of hands that should be profitable almost regardless of postflop tendencies, assuming your opponent is opening wide enough.
There are, however, some postflop tendencies that might make you want to play more hands against someone. If they are passive postflop, then you're going to get a "4-card flop" more often, which helps a lot of your drawing hands or your A-hi and K-hi that want to get to showdown. Also, if they have trouble folding postflop, your implied odds become huge with suited and connected stuff. There are some other things you can think about postflop, these are just a couple of examples.
Against a nit, we tighten up our defending range. We might tighten it up a lot, to like 25% or so, if this guy is only raising 10%, or we'll just tighten it up a bit if the nit is tight, but positionally aware and thus opening semi-wide in the SB.
Against a LAG, we almost can't widen our range very much because it's already so wide, but we can make some plays to exploit him terribly postflop. Supposing he's cbetting 75% of the time, and he's on a 50% range opening from the SB. He's very, very weak here after his cbet. We can float him, bluff-raise him, call down light, and generally make his life miserable postflop. His aggression can't compensate for his positional disadvantage when his range is that wide.
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