The $80 Shimano Deore or $82 Shimano SLX Cassettes will last you far longer than the $390 XTR cassette. All of these cassettes have the exact same functionaility, with weight being the only difference between them. The XTR is made up of aluminum, titanium, and steel cogs. The aluminum and titanium allow it to save 8oz over the all steel Deore, but being softer metals they will also wear faster. For everyone except pro racers, the Deore/SLX/XT are where you want to be. Really though, the weight savings between each of these three is only about 60g. The Deore is all steel, the SLX swaps the largest cog out to aluminum, and the XT swaps the two largest to aluminum. For absolute longevity, go with the Deore. For a slight weight savings and a cool looking black largest cog, take the SLX. The XT is $50 more and doesn't get you enough to justify the price jump, imo.

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Helpful Links

My Shimano 12Speed Cassette Comparison Guide Complete with exploded views, product links, part numbers, etc.
https://docs.google.com/spreadsheets/...

My Shimano Crankset Comparison Video:    • Shimano's Deore Crankset is $477 CHEA...  
My Shimano Chain Comparison Video:    • Shimano's XTR Chain Is Actually the B...  
My Shimano Cassette Comparison Video:    • Shimano's $82 AllSteel Deore Cassett...  
My Shimano Shifter Comparison Video:    • Shimano Shifter Showdown | How is the...  
My Shimano Rear Derailleur Comparison Video:    • Deore to XTR for less than $25!! | Sh...  

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Product Links

Cranksets
Deore https://amzn.to/3Pxh8N2 Best Bang for Your Buck (Tied)
SLX https://amzn.to/494nZEF + https://amzn.to/3PyBQfE Best Bang for Your Buck (Tied)
Deore XT https://amzn.to/43yzymk + https://amzn.to/4aqFuA7
XTR https://amzn.to/3x6wqlR + https://amzn.to/3PICp6R

Chains
Deore https://amzn.to/3uYSq1e
SLX https://amzn.to/49Imehx
Deore XT https://amzn.to/3PaSO3x
XTR https://amzn.to/4c1Yl6h Best Bang for Your Buck

Cassettes
Deore https://amzn.to/3wqtno2 Best Bang for Your Buck (Tied)
SLX https://amzn.to/3wsZC67 Best Bang for Your Buck (Tied)
Deore XT https://amzn.to/4bJ7Ua6
XTR Check your LBS!

Shifters
Deore https://amzn.to/47DdSXy
SLX https://amzn.to/3uKO79n
Deore XT https://amzn.to/3sYA27J Best Bang for Your Buck
XTR https://amzn.to/438XxbS

Rear Derailleurs
Deore https://amzn.to/3qKyAVl
SLX https://amzn.to/45k4Ygy Best Bang for Your Buck
Deore XT https://amzn.to/3YLjFGY
XTR https://amzn.to/3V2JK4l

Deore/SLX Pulley Set https://amzn.to/3sdUd0v
XT Pulley Set https://amzn.to/3si35SN (Can be used to upgrade Deore/SLX)

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Chapters

00:00 Opening
01:52 Intro
02:15 Specs & Pricing
05:41 Conclusion
07:18 Outro

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Music from Uppbeat (free for Creators!):
https://uppbeat.io/t/avbe/nightinkyoto
License code: 6K4OQOGT6VQSQL8G