For example I am giving two links here, please tell me which one is better and why/how.
IF-ED lens:
http://www.flipkart.com/nikon-af-s-dx-vr-zoom-nikkor-55-200-mm-f-4-5-6g-if-ed-lens/p/itmcx3sgrhsrgthz?pid=ACCCX3SGRHSRGTHZ&srno=b_2&ref=37310b92-f5a5-4e73-aa02-b1d822cc1f6c
ED lens:
http://www.flipkart.com/nikon-af-s-dx-nikkor-55-200-mm-f-4-5-6-g-ed-lens/p/itmdpnfgv7afgugs?pid=ACCDPNFGV7AFGUGS&srno=b_18&ref=37310b92-f5a5-4e73-aa02-b1d822cc1f6c
Read more: What is the difference between a Nikor ED lens and a Nikor IF-ED lens?