brand and quality has a lot to do with it
i cant make out the brand of the 2 up top
but i can see the bottoms a koralia which is a well trusted brand
cheap pumps last maybe a year as good pumps can last 5 years
i would go with Koralia's over any knock off
more dependable and a lot quieter ive used cheap power heads before and they made more noise and buzzing sounds they drove me nuts i wound up replacing them with in 6 months, i like the quiet as my tank is in my living room