I can't see how Cruz / Rubio end up being better than Trump
Both would have at least some sense of self respect and ability to empathize with others. Not a lot, but when compared to Trump almost anyone would possess those two qualities more than he does.
Legislatively, they would be more willing to work with Congress. Both would have more sensible responses to the pandemic that quite probably would result in less lives being lost. Make no mistake, a portion of the lives lost thus far are directly the result of Trump's mismanagement.
It's unlikely neither would inspire a literal cult of hatred and racism, nor would either openly incite violence and even encourage death to detractors as Trump has done.
The massive corruption seen during Trump's tenure is large, rare at such levels, and almost unheard of, so it's unlikely neither Cruz nor Rubio's potential corruptions as president would have risen so high.
Neither would seek out illegal aid from foreign countries to meddle in our elections. Neither would have been impeached for such a treacherous act.