Passerby

That depends. If you have a character creation mod that you can export facedata for then you'll want to change your race to this race then upload the facedata you've saved. That's realistically the only way to get the ears without going into the game and adding the ears to all imperials...which you probably don't want to do, the ears are picky enough to match shading with as it is, it'd just lead to a bunch of imperials with funny mismatched ears.

I was reluctant for awhile, but once I hit a mod that used racemenu that I wanted I had to make the move from ECE. It's different from when I last compared them, RM seemed to be a lot more barren before. Even though I feel like ECE had some sharper jaw sliders somewhere, from what I see in this thread I'm probably not remembering it quite right.   Either way, if some creative uses of overlays start coming out then I'd certainly side with RM without hesitation, but the rate at which both are changing seems to indicate RM's the overall victor at this point anyway.