The price difference you pay between 330e and 330i will all be balanced up by the time you want to sell the car.  Meaning the 20k saving on 330e will take a hit when resale.  It's just the timing difference, if you pay more now, you get more in future.  If you pay less now (for 330e), you get a lot less when resale.

For e.g.

330i, bought 304k, after 5 years sold for say 154k, you lose 150k

330e bought for 283k, after 5 years sold for say 130k, you lose 153k

Of course the time value of money or the interest cost is not covered in the above example.

B series engine not that worried for the timing chain guides parts as compared to N series.

The latest information i gathered from my mechanic is that B series got coolant or water level keep going low even during warranty period and need to top up time to time. Warranty claimed from owners feedback turbo coolant pipe leaking to EGR internal coolant leak, some even did not manage to claim anything even going thru pressure test etc..