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The OEM rft tires on the E89 are very bad. Ride is harsh and grip is limited when paired with 19 inch rims. The M135i is available with much better tires from factory. Otherwise I would say the M135i is easier to drift, probably because it has less weight over the rear wheels compared to the Z4. The M135i also feels more direct and less laidback, which is good or bad depending on what you like... think GT vs sportscar feel... different strenghts. With better tires the Z4 is more comfortable, however depending on whether you choose M sport suspension or not. The seating position is lower and closer to the rear, so you get that roadster feeling, which is something you may or may not appreciate depending on mood and driving purpose.
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