Which is better, powder or liquid detergent?

Neither powder nor liquid detergent is definitively "better"; the best choice depends on the specific cleaning needs and priorities.

Powder Detergent: Strengths

Powder detergents excel at:

Removing tough stains: They are particularly effective against dirt, clay, and mud. Jennifer Ahoni, the director of scientific communication for North America fabric at Procter & Gamble, highlights this advantage.
Cost-effectiveness: Generally, powder detergents are less expensive per load compared to liquid detergents.
Stability: Powder detergents typically have a longer shelf life than liquid detergents.

Liquid detergents shine when it comes to:

Grease and body soil removal: Liquid formulas are formulated to tackle these types of stains effectively, according to Jennifer Ahoni.
Pre-treating stains: Liquid detergent can be directly applied to stains for pre-treatment before washing.
Dispensing: Liquid detergents are easy to measure and dispense.
Dissolving in all water temperatures: Liquid detergents dissolve well, even in cold water.

Feature	Powder Detergent	Liquid Detergent
Stain Removal	Excellent for dirt, clay, and mud	Excellent for grease and body soil
Cost	Generally more cost-effective	Generally more expensive
Shelf Life	Longer shelf life	Shorter shelf life
Pre-treating	Not ideal for pre-treating	Well-suited for pre-treating
Water Temperature	Can sometimes leave residue in cold water washes	Dissolves well in all water temperatures

Water hardness: In hard water, powder detergents may not dissolve completely, leaving residue on clothes.
Dispenser type: Some washing machines have dispensers designed specifically for liquid detergents.
Personal preference: Ultimately, the choice between powder and liquid detergent may come down to personal preference.

In conclusion, there's no universal "better" option. Assess your laundry needs and prioritize accordingly to make the most effective choice.