Both get superb reviews. Can't say much about the federals as i went down the kumho route.
On the road the kumho's are just great... wet and dry, nuff said. On the track they are again great.. BUT... at the final 90% or so of grip, the kumho's feel a bit funny, hard to say... starts feeling a little less predictable of what its gonna do... go into mild understeer or still have grip or lose grip?? It gives me a feeling of a little uncertainty of what its gonna do, but only at that final 90% or so...
It could be that the tyres were brand new and were not properly scrubbed in yet... we'll see how on the 11th next week, if its gotten any better after some miles on it now...