BMW service options in Musaffah - dealership vs independent?

So my 530i is due for its major service and I'm at that crossroads where I'm trying to decide between taking it to the dealership or finding a good independent specialist instead. The dealer quotes are absolutely eye-watering and honestly I'm not convinced the service is actually any better for the price they charge, but at the same time I've heard horror stories about people taking their BMWs to random garages that don't have the proper diagnostic tools and end up causing more problems than they fix. I specifically need the timing chain checked because I've been reading about some issues with the B48 engine and it's been playing on my mind, plus the gearbox feels a bit jerky in stop-start traffic which is probably a software update thing. I've been doing some research and it seems like there are a few places around that actually specialize in German cars and use genuine parts, and I came across a few recommendations for Genuine BMW Service in Musaffah , so I'm leaning that way if I can find somewhere with a solid reputation. Has anyone here taken their BMW to a non-dealer workshop recently and been happy with the outcome? I'd love to hear about your experience before I make a decision because honestly I just want peace of mind without breaking the bank.