Aftermarket rear calipers vs genuine

Need to replace one of my rear calipers as its seized and would prefer to buy a new one over rebuilding. Was browsing eBay and came across this one. It's made by TRW who make the genuine renault ones and looks pretty similar. Does anyone think the quality of this one is much different? Also would I need to replace both sides at the same time as they are different calipers?
 
It certainly looks like it’s the correct calliper. As for quality it should be identical to the one which has Renault written on them. You can see in the pictures above where theres a slightly darker section of red paint would be where Renault would normally be written if you’d bought the Renault ones.

My personal choice would be do both as if ones seized the other will likely sieze soon too. But there’s nothing stopping you just doing one if that’s what you want to do.
 
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