Stock air cooling on both units would be about the same, if youre planning on overclocking on Air then the matrix is the way to go but of its all mesh grill front. But for esthetics/watercooling id say go with the Swing. The Swing has the same stock air cooling (2 x 120mm) but doesnt have the TT ugly green/purple quick toolless system (so it would look awsome in the windowed version to show off the WC setup without distracting ugliness). So I'd say go Swing for Water OC'ing and Martix for Air OC. Hope it helps you decide!
PS: My old system has the Tsunami case from TT. Basically very similar to the Swing in design AND it has the same piano black finish which looks Amazing (when kept clean, hehe)