The top one is obviously the more expensive one. One is a hobby lathe and one is a precision made industrial tool that will probably last longer than the operator and is capable of fine work in the right hands. It's all about precision. The hobby lathe will probably be accurate to 0.001" or 0.002" but the myford with skill and experience 0.0001". It's all about the rigidity of the bed, the precision of the screw feeds and the quality of the bearings. The myford chuck probably cost more than the chinese lathe when new. Myford is good gear.