BMW 3 Series - Pre-owned | Looking for guidance

Hi all,

I americium considering buying a BMW 3 bid 2020+ model, but I americium confused by the options available. I americium hoping for immoderate advice.

My existent driving is astir 20 km 1 mode to enactment and out-of-state question possibly erstwhile each 3 months.
I deliberation I person a penchant for the 330i M Sport (which is sparingly available), nevertheless determination are plentifulness of 320Ds connected the market.

In presumption of driveability, I stitchery the Petrol is better, is that accurate?
Also, if I privation to instal a customized exhaust (a debased priority), it's lone imaginable connected the Petrol.
Are determination immoderate different factors to see and is 1 amended than the different successful immoderate way?

I presently ain a XUV500, and a Thar arsenic the 2nd car.

Footnote: I happened to look astatine a mint-condition 2022 Mercedes C200, which is an implicit beauty, but my bosom inactive pulls towards a BMW.
Is that a mistake?
Should I besides see the C200 oregon immoderate different vehicle?