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I'd say either car is a great car but my preference would be the N55 over the N54. BMW seemed to learn a lot from N54 mistakes. The good news on the N54/135i? Most of what can go wrong with it is easily found using Google.
Some items to look for on the N54. Bad high pressure fuel pumps and issues with wastegate control solenoids for the car's turbos along with the wastegate itself. Replacing solenoids is a relatively easy fix. If the wastegate fails, that's a much, much bigger problem as the entire turbo will need to be replaced. Some opt just to use a different turbo at that point since it's going to take two solid days of work to swap out turbos. As labour will exceed part costs by a significant margin, might as well put in better turbos.
If you really want that 135, there are lots of N54 owners out there and some really love the engine as a tuner engine but I'd do a lot of research on it to get a realistic idea of how much money you'll need to fix any issues.
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