Point us to the actual PSU models mate (or model numbers at least)
PSU component quality is far more important than those rail ratings at the end of the day.
420w available on a 450w psu is absolutely acceptable in wattage terms (first pic)
& 540w available on a 550 or 600w unit ia also absolutely acceptable.
It means they can fulfil their full wattage label rating.
The second pic with ripple percentages & full load efficiency rating would lead me to believe its a good quality unit from what I see
However the wattage table rating is not a good indicator overall of the actual quality of the power being provided.
From the tables both those psu's would run a 1050ti EASILY
A 1050ti itself only requires 75-90w (depending on model)...