I don't care much about horses, I usually never have more than 2-3 at any given time, just to kill off injured stragglers. And I don't remember when I didn't have at least a dozen horses, including most of them from CS. We're are gonna get a couple of city states, sooner or later.
I'm more concerned about iron and I don't think any map have the higher probability to get us some, except maybe 1, at least of what we can see. IF No4 got iron too, it might be the best map I've rolled.
I'm not biased at all.