I have been using Humalog for many years and have never tried Novolog or Apidra. My friend, however, is Type 2 and using insulin. He used Apidra for several years and loved it. Then his insurance plan required him to use Novolog instead. He found that to maintain his great blood sugar control he needed considerably more units per day than he had with Apidra. With the increased dosages he gained weight even though his diet and routine had not changed. To get his weight back to normal he had to cut his daily carb intake to 80g per day. He is back on schedule now but he is not happy. He misses his Apidra.
I do not think that most diabetics would need more units of Novolog than Apidra, or that increased dosages would cause significant weight gain. I do trust my friend 100% though. We are all different.