I have both, Time Capsule A1470 (ME177LL/A) and AirPort Extreme A1521 (ME918LL/A). Sunon fan (MG60121V1-CO1U-S9A) was in TC, Delta (BSB0712HC-HM01) was in AP Extreme. Both were running for ~4 years. Even though Extreme was running in harsher conditions (in attic: lots of dust, more extreme temperature conditions, construction dust, etc) Sunon fan was the one that failed first - TC was showing as overheating and the fan run much louder. I replaced Sunon with Delta and everything was back to normal.
If you need to replace your fan (try oiling it first), for me Delta looks more durable, but still, Sunon had to push more hot air (from hdd) and, ofc, ymmv.
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