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SLX could compete, but if Shimano follows their usual release schedule, it's 2 years before release. It is probably going to be very good, but Shimano will loose (some) sales to Sram until then. Current SLX isn't too far off with the 11-46 cassette, ~9% difference from Eagle NX in range, but the 9-tooth jump from 37 to 46 looks like they took the easy way out. Also 12 > 11 for many consumers. Last Eagle eTAP is coming, while Di2 is not coming this year it seems. I think Sram is ahead currently, but competition is good.

I'm totally opposite. Having ridden Eagle GX for 9 months (but I'm not putting as many miles as others might) I'd take it every time (coming from X0 2x10 and earlier 3x groups). My wife had X01 on her bike and it was noisy and never shifted great whatever I did to adjust it. Eagle GX has shifted great and been very silent since day one, and the added range is nice.

Regarding weight of the cassette; I'd take 1x any day for a hard tail as long as total price/weight/performance is about equal to 2x, and might even for a full suspension bike (with increased un-sprung weight) due to function and simplicity.