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They all have their plusses and minusses. The engines in the 330i and pre LCI 335i can be unreliable. They both suffer from injector failures, water pump failures and high pressure fuel pump failures. They're both Direct Injection, so coke up in the intake valves, losing performance.
Plus side, they're both very comfortable to drive. An MSport 330i and any 335i (MSport and SE) all have the same suspension setup. (An SE 330i has a softer suspension setup).
The e46 M3 will need to potentially have it big end bearings looked at, and the subframe looked at. Other than this, the other thing to look for is rust.
However, as others have said, the 330i / 335i will still lose value over the next few years. The E46 M3 will not. Certain parts for the M3 will be more expensive, but due to the age of the car now, there are a lot of pattern parts which are cheaper than the original BMW ones. Despite it being an ///M car, they're still relatively easy to work on.
If it was me, i'd go e46 M3.
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