I have gone back to the std apple offering and decided its much more comfortable for my ears. I had convinced. Myself that the memory foam was better but then I damaged one and had to revert to the supplied silicon.
Was very surprised to prefer them.
I think the silicone probably is more comfortable but the problem is that they get slippery from the oils in my ears, so on a run or after a few days of use, they become useless.