Liquid is supposed to be concentrated, if you use too much and don’t rinse enough you won’t really remove smells/bacteria. As others mention, it is best to read manuals and instructions. If you don’t use enough your clothes will smell like the worst thing in the wash.

I hardly see powder for sale in any shops where I live, so liquid gets the convenience points.

When I do see powder, I buy it because it is useful for setting the delayed start on my washer. I used to do pods, but they are awful, especially the pods filled with liquid. The water is so hard where I live, maybe that had something to do with it.

This one works. I’m a prof and people get me to download papers for them all the time.