Agree that neither is stronger, they work differently for different people. It sometimes depends on which you try first as some (maybe all?) people lose response as they go through the anti-TNFs. I hade great success with Remicade for years, went off to have a baby, tried to go back on and had infusion reactions, tried Humira (didn't work) and the. Simponi (didn't work) and am starting Stelara tomorrow.
I was on imuran for a while with Remicade and then on it and the other two alone.