Mulch mats or grass mulching … 

Mulch mats provide a barrier to suppress weed growth, retain moisture, and regulate soil temperature.
while grass mulch involves using shredded or cut grass as a natural mulch alternative. The main difference lies in their composition and application.
with mulch mats offering a more uniform coverage and longer-lasting weed suppression compared to grass mulch, which may decompose more quickly but can enrich the soil as it breaks down.