by MrMT
All three are great games. RuneWars takes longer to play though, and has a higher starting hurdle.Kemet and Cyclades are comparable in terms of length of complexity, and easier to get to the table.
It comes down to what you enjoy. Both scratch similar itches; I personally slightly prefer Cyclades, because I love the tension of the auction phase - which is very personal - and because it offers the possibility of great creative flourishes, but others prefer Kemet.
I think you can't go wrong with either, but my bias is go for Cylades. It's a little more intuitive than Kemet. My only proviso is that you will want the expansion shortly afterwards - which is a little pricey.