I've never been much of a fan of 5-eyelet chukkas. Frankly, I view them as something a bit outside the chukka family and more of a short generic ankle boot. For me, 2 or 3 eyelet chukkas are the way to go.
The lines of the CS are very appealing if you are looking for a dressier option. The Carminas will probably work better in a casual context while still working fine with a sport coat. I do prefer Rain last for this application, however (and own a pair in blue suede that have served me very well).
If I were buying I'd probably give the CS a try because the sleek elongated aesthetic really floats my boat.