I have tried both methods repeated;lyrepeatedly and don't really see any difference. I have stored yeast with trub up to 5 months and have gotten great results reusing it once I made a starter. I recently made back to back batches of rye IPA, one with yeast mixed with trub, the other from the same yeast slurry that had been rinsed. There was no difference in either yeast performance or flavor.