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I'd say an N55 makes a better daily car due to the easier maintenance and the toque comes on a bit earlier in the power-band (especially with a tune). Stock turbo doesn't make as much extra power when you tune it, but if you're power-hungry you can upgrade the turbo. Stage 1 will put you on a similar level to N54, stage 2 will turn it into a tyre destroying beast.
The other benefit is that you have the newer LCI model.
Also the N55 might cope better on a track, it doesn't seem to have overheating issues when abused. Mine survived a 20 min track session pretty well with a stage 1+ MHD tune, only my brakes let me down. Although it was my first track session, so I didn't push it to the limits.
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