Originally Posted by twinpilot001
yes i am aware of that - yet which one is best??
"Best" depends on how you plan to modify it. The Turbo Buick community has found and fixed about every weak point on the 200-4R and upgrade parts are readily available. The nice thing about the 200-4R is that the trans is the same overall length as a TH350 or Powerglide. The trans mount location is in the same place as on the TH400. This makes is a bolt-in on earlier vehicles and you can usually find a stock driveshaft that fits. The 700R4 is unique in these dimensions. This isn't a big deal, it just requires drilling a few holes and having a driveshaft made.
The other fundamental difference is the gear ratios. The 700R4 has a steeper first gear, which might be better for towing. Unfortunately this also means that there's a big ratio drop between first and second. The 200-4R has more evenly spaced shifts.