none of those are bad tires. I've had the HTR-Zs on the A4 at one point and the 615s are awesome in the wet at the track, don't listen to Kevin. Newer 615K ones are supposed to be better all around.
Which Sumis? II or III? IIs and v12s are directional so you can't swap sides. III, XS and 615K are asym so you can.
Really depends on what you want to use them for. Sumis and Hankooks are going to be better street tires than the Kumho or Falken which are more autocrossish and will likely wear faster.
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