There are different opinions regarding this issue and every opinion has its own argument
1- If you are in stable job and your PD is very far and for sure your AOS will be pending for years and years, by which you will waste all 6 years of H, it is better to work with the EAD and renew it yearly. So, you will save 2.5 years left in your H in case your GC application gets denied.
2- The H renewal and extension protect you from sudden denial of your GC application and by then you will be out of status immediately, again if your PD is far, no one will touch your file to approve or deny you and for sure you will waste your H years.
3- If your job is not stable, the H will protect you from the employer to great extent. But still if any thing happen with your job, you will be obligated to use the EAD any where else.
So, manage it according to your situation.