The SXUT is a utility token for the platform while the SXDT receives dividends from the platform.  This here goes over both tokens: https://docs.google.com/spreadsheets/d/1IMrbIf5YHo-GUqkpL0TBQWbDHzCaSG_Gadtvpm0AUBk/edit#gid=0

This here goes over the costs for the privileges the SXUT unlocks: https://docs.google.com/spreadsheets/d/1e22Pjeh517cBuN_ODCfdyZkmppZbW2AesqvSkRv9rW0/edit#gid=0

This goes over the SXDT dividends and how they work: https://d1zzssn32v8b7a.cloudfront.net/media/spectre_dividend_protocol_SXDT.pdf

And this goes over the DALP (which is where the annual dividend for the SXDT comes from): https://d1zzssn32v8b7a.cloudfront.net/media/spectre_dalp_protocol_SXDT_v1_1.pdf