Debt avalanche usually saves more money. Debt snowball usually creates faster emotional wins.
Why avalanche wins on math
Avalanche attacks the highest interest rate first, which usually reduces total borrowing cost faster.
Why snowball still works for many people
Snowball clears the smallest balance first, which can improve momentum and reduce the number of active debts more quickly.
Bottom line
The better method is the one you can follow until the balances are gone, not the one that only looks smartest on paper.