There are lots of interesting and sometimes conflicting studies on this. For something like UBI, it seems they do better when they give the same amount of money to everyone. It not only reduces stigma, but ends up being more equitable - particularly if the ultra wealthy don't bother to take it.

But yes, money given to the poor goes back into the economy, rather than money to the rich (like most of those business loans during covid) which went to the stock market.