The bottom line is that whatever floats their boat is good. After all it is their dime, so as long as they are happy with the result.
Considering the OP asked if building a stroked 318 was better than a 340 or 360, we should keep our focus in that direction. Big blocks are their own kettle of fish. Fit and weight are concerns there.
As to the stroked 318 vs 340 or 360, I figure build what you have if it is sound. Then we could get into the numbers match pot, where a stroker can sneak in, in disguise as it were.