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It's fairly close for peak hp and torque but the volume under the curve is still better throughout the entire rpm range on the N55. Many people have also commented that the N20 is pretty maxed while the N55 has far more headroom to expand reliably. There are some reports of people (not on an X1 though) getting over 400hp and torque on the N55, though 330-360 hp/torque is pretty easy to get and still maintain reliability.
If you are looking for performance don't forget to consider other performance aspects such as brakes, transmission and wheels. IMO I found the 35i far worth the heavier engine and 2% weight balance difference that come with the 35i.
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