OPT bata directly greencard garyo bhane EAD card within 14 mths aaudaina hola..coz EB3 ko processing time is very long...even after u apply for greencard you have to have atleast H1 visa or EAD card to work legally..so it is better to get H1 first ani then apply for greencard...yo process ma EAD card chito naaye pani u will still have H1..

btw please do more research through official immigration websites for greencard process and requirements...also get hold of immigration lawyer at your company and ask him/her....rather than completly depending on sajha users..since each person ko case different huncha you will not be able to get complete information through sajha..

All the Best !!!!