I am always curious what kind of cable do head-fier prefer?
Me myself prefer the round type (Conventional) type of cable, it is often light and less microphonic issues, what you guys think?
Yes you can, I do it all the time :p Just make sure the cable doesn't twist going over your ears. It'll actually just slack straight down if you do it properly :p Now, obviously, there is a set thickness where the cable will go over the ears. I have yet to run into an IEM with flat cables that I couldn't loop over my ears though (thickest I used was a pair of Scosche IEM856).
Flat cable isn't as durable as the rounded one. My TDK BA200's extension cable went dead a few months ago. Luckily it was only the extension one and it's easy to replace it. I also have problems with mouses with flat cable. I have replaced my ******* Logitech mouse 3 times within a year due to cable failure.