my '87 caprice with a 305 had a 200-4r, as does my '87 wagon with a 307 olds. they also came in g-bodies. from what i have researched, there isn't much difference in strength between a stock 200-4r and a 700r4. they are both plentiful. i'm almost certain the 200-4r has a better 1st gear, but it's been a while since i've researched this stuff. the thm200 was a cheaper 3 speed used in place of the th350 in the late 70's and early 80's...and that one sucked. the 200-4r is based on that transmission i believe, but with stronger internals and overdrive.
if being used behind a more powerful engine, i know a weakness of the 200-4r is its small diameter input shaft.