Best Tires for the BMW E91 325i

I am not driving that spirited, especially on winter tires - thus take my grip specifics with a grain of salt. In the grip category i don't see reason to complain. Sometimes i am in the mood to take an on-ramp near the limit of grip - behavior here seems normal to me, the car tends to understeer. The previous winter tires i bought the car with were 8 year old Marangoni Meteo HP and those sometimes tended to oversteer and had quite bad wet grip, so i replaced them with these. After one winter season the front tires are severely more worn than the rears, i dont expect more than two seasons, so ca. 20000km out of these. On the inside of the car the tire sounds fairly loud with a repeating growling which feels a bit like a outgoing wheelbearing is described. My eagle f1 asymmetric 5 summer tires are far better in noise and comfort, which is important to me. The tires performed very well in the heavy snow we had this year. My car is lowered a bit and even with loose snow around the 10 cm mark i didn't get stuck while having a short donut session in a parking lot. I suspect with the immense wear now on the rear tires i would have more trouble in a similar situation. All in all i do not like these tires a lot but they are not horrible - for my next set of tires i will try another model in hopes of improving wear and noise.

I have installed two new tires at the front side for one week.Everything feels similar compared to the Pirelli P-Zero which is at the rear side. One thing that I am surprised is the tire depth is only 6mm when new! I am not sure how long they will last.

I used these tires last winter and now they are put on my car again. On snow they drive very well. On ice ABS & ESP may flash, but it is still OK. On dry and above freezing temperature, their braking distance is longer than the 17 inch summer tires.

As compared to the summer run flat tires, they are much softer, silent and comfortable. The steering wheel is much lighter. The tire wear is negligible too. If the summer run flat tires are half as good, I believe that much more people will stay with run flat tires instead of going to "normal" tires.

This tire lies in the front of my car, wears very unevenly and generates terribly loud noise. It has rim protection that didn't fully stop my whe els from kissing the curb. It is very old tires design, even its successor CSC3 is being replaced by CSC5. So luckily I don't have to buy this tire again.

Positive: they wear evenly as compared to other run flat tires I used (Michelin Pilot Primacy ZP, Continental Sport Contact 2 SSR), thus generating less noise due to the irregular wear. The grip on dry and wet is excellent, the braking distance is short. They are also slightly cheaper ("only" Euro 200 each before installation).
Negative: they are hard as other run flat tires. I check tire pressure once each month, but they still wear out fast. After 6000km easy going driving on mostly highways, half of the tire depth is gone. The tires may last around 12000km in total, which are expensive for the price.
At this tire size, there are not many run flat tire choices. At least these tires have much newer technology and have better reviews compared to others (Bridgestone RE050A run flat and Continental sport contact 2 SSR). Sometimes I am thinking of replacing them with normal tires, but it doesn't seem safe and interesting to use either spare wheels or tire sealant on the highway shoulder especially in dark. So probably I will stay with these tires.