Rear shocks - Bilstein vs Sachs?

[svvg]

Getting my moneys worth from the forum this week.

I have a 4.8, with dual axle self levelling air suspension, with 122,000 miles. I’ve rebuilt my air compressor- so a new piston ring, new head, and importantly washed through the felt filters around the dryer/desiccant which I think had become blocked. That all works fine.

The front two airstruts then popped at the same time…. (They’d perished and cracked, and when I was raising the car (messing about with buttons on the driveway….) it exposed the torn cracked sections and air started gushing out of the splits - so I replaced with Arnott front shocks.

My rear air bags are fine - but the car is a bit bouncy - the arnotts definitely feel a bit bouncier than my original worn bmw versions - but they were half the price(…..). The back end of the car now kicks out at the rear when hitting bumps, so I think it’s time for new shocks (I will drop them out over the weekend to double check how knackered they are - but it’s a 2004 car and has 122,000 miles - so I’d imagine they’re tired at the very least).

So…. Does anyone have any experience of Bilstein B4 vs Sachs rear shocks on this set-up? Or even Arnott shocks?

Grateful for any experiences/recommendations!