2900Km of mostly Peak District so far on my XT. New chain just fitted. No issues.

Never run SRAM though.

I’ve always found SRAM longevity really good on trail and enduro bikes, if a bit pricey. However, on my Stage Evo I’ve been running a Shimano rear cassette and chain and just renewed the whole chainset after 2,600 miles largely riding in gritty loam. The 1st chain was KMC and the 2nd chain which had stretched way beyond 1% was Shimano and the shifting was still OK with … GX AXS.

I bought the GX AXS because I’d read about the quality and robustness of the gear changes which is exactly what I experienced. The noticeable increase in chainset longevity compared to previous Shimano experience was a bonus.

I can’t comment on the Eagle, but my SLX is still running ok after 3000 miles (with a mixture of bridleways/byways, trail centres and roads, including the slop last winter) – I’ve been quite impressed by its longevity. I’ve rotated between two chains (both XT) whilst it’s been on. When it stops running well I’ll probably replace the whole drivetrain.

Just to add I’ve used a drip on wax-based lube (Squirt) exclusively with my SRAM Eagle drivetrain so that perhaps helps to add some longevity in comparison to wet lube.

That’s odd, Deore should be 60g heavier due to the biggest cog being steel.