It is a shame marketing has convinced the tool buying world that heaver and thicker is better. I know broken record and all that rot.
One of the Stanley's has a Ray Iles cutter the other a Japanese HC laminated iron. Both work very well in older Stanley planes. For now I'm using a Hock cap iron with the Ray Iles iron because good Stanley cap irons are hard to find.
Of the smoothing planes these are the least used, although the one with the Japanese iron is a very sweet working Type 9 and it is becoming my goto plane when I want to put a final finish on a board.