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i've had an E46 330i and now an E90 325i.
The 325i is smooth as silk, sounds lovely at low RPM, moves the car around easilly and is spirited once you get the revs high!
But the E90/91 etc 330i is quite a lot more powerful and has quite a bit more torque from lower down. Its not night and day, and you're not going to notice massively profound differences in them, but for sure my old 330i was faster in overtaking, mostly due to having considerably more torque than the 325i.
I picked my 325i based on spec, mileage, condition and warranty etc. I'd let that be your real guide. Get a good 325i rather than a poor spec 330i and vice versa. IN the real world, theres not a HUGE amount in it.
The 325i is also capable (in theory) of ever so slightly better fuel economy. If thats your ultimate concern, then its probably the more rounded of the two.
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