I prefer the Mongol's Keshik and its traits to Arabia's traits and it's Ansar, however, a speedy UU is nice to have as one is usually eager to get them rolling..the Ansar comes at a time (as does the Keshik) when alot of civs have their UU tho,...which is why i like the Conquistidor best of all...it comes at a time between other civ's UU's and is the fastest of all.
In so far as color....these creator guys need to experiment a bit with Value...look, u can have at Least three really distinct shades of any color , a dark, a middle and a light. How hard is it to make a clear distincion ? 6 main colors , plus black ..that means on a huge map one could have 21 distinct colors.
If one wanted more than one simply would add to the 6 main colors (red green blue yellow orange violet) making a Red/orange green/blue ect. scale, -each toned to three shades of- dark (really dark) -middle (nice and clear)- and light (really light)-creating 39. (and if one wanted even more then add yellow/orange yellow/green ect) -making 51.
And too ...Relativity...a big idea-and in color theory about as
far as we have gotten....which is to say that if u have 18 civs then the computer should select colors that are seperate in so far as there relation to each other as visually percieved.