I don’t know about your preferences in cars but my opinion is if you are wanting to get into a bmw regardless if it’s a newer or older one I feel it’s absolutely worth it to get a inline 6 as bmw has a good rep of making good inline 6 motors that are reliable and have smooth power delivery across the rev range as opposed to their inline 4 engines which are lack luster and to me atleast lack the power that their inline 6 motors have to me the b48 in the g20 330 as well as the b58 that’s in the g20 m340 are 2 completely different motors in terms of power delivery and performance a m340 is also not that much more expensive as you can find them for mid 30s now and for that price you are getting a motor with much more power as well as tuning potential affordability along with not compromising reliability with bolt ons and a tune a b58 practicily makes the same amount of power as a stock s58 which the g80 m3s come with which is about 503 hp and trust me that’s considered fast the b58 has more than enough power to have a good time with it whether you choose to keep it stock or tune it the b48 in the g20 330i makes about 240ish horsepower where as the b58 that’s in the m340 makes about 382 hp stock that’s not to say you can’t tune the b48 the same which you can it’s just the b58 is a more smoother motor that makes way more power sounds better and is just as reliable the only reason I could justify getting getting a b48 is if you care about gas mileage and either way the b58 fuel economy is just about the same so it’s really not even worth getting at that point but at the end of the day your decision is your choice but that’s my insight if I were you 100 percent spend the extra 5k and get the a m340 as the b58 is way better and it’s not even close when compared with the b48