French beans (or "green beans") are widely sold in both dwarf (bush) and climbing (pole) varieties. If anything, my experience is that the climbing varieties are harder to find in seed outlets.
Apart from the obvious the difference - dwarf plants take up less space and you don't need to support them - are there are any other differences?
For example, flavour, heavy cropping, choice of varieties, length of cropping, environmental tolerances?
I'm assuming the dwarf varieties have been manufactured more recently (but I have no idea whether that's true). So is it possible that the gain in convenience has been at the expense of something else?