Biggio's career splits lefty/righty are eerily similar.
He has a higher OBP v/ lefties, higher SLG v/ righties. wRC+ is exactly 113 for both, wOBA v/ L is .340, v/ R is .341
Not really a guy you need to sit v/ lefties. (Big difference in PAs left v/ right, but that's to be expected as there are far more right handed pitchers...)
He's been worse against lefties this year, but it's a 54 PA sample size, so hard to read into.