these two shoes are both cost-effective! DS2 is specially designed for domestic outdoor places, so it is definitely better than KD3 in durability! So I recommend DS2. DS2 is also a signature shoe, but it is not as orthodox as KD3. If you want to care about these, buy KD3! As for the scientific and technological content, ZOOM AIR still has a good shock absorption function! My friend upstairs said that few NBA players wear DS2, that's for sure, because KB came to China and made these shoes specially for the outdoor production area in China. What should I wear for playing board infield? Ha ha!