Do different USB-C to HDMI adaptors produce different picture quality?

[Minxy]

I have a Mac mini attached to a 1080p monitor via HDMI and the picture looks fine. I have a work MacBook Pro which I have attached to the same monitor using a third party USB-C to HDMI hub and the picture quality is worst; less sharp and blurrier but usable. So I tried using the USB-C adaptor to connect my Mac mini to the monitor (I removed its direct HDMI cable) and the pic still looks bad. Is the picture quality always going to look bad with an adaptor, even the official Apple adaptor, or is the quality likely because I'm using a low-cost product?

I chose it because it was one of the few low cost options that had HDCP on it.

 

[joevt]

What USB-C to HDMI hub did you use?

1080p is low resolution so any adapter should be sufficient. It's only when you get to 4K that compromises need to be made.

I suppose comparing output from AGDCDiagnose can help describe what is going on. Run the command with the display connected to the HDMI port of the Mac mini, then run the command again with the display connected to the USB-C adapter (use a different file name for the output file). Run the command on the MacBook Pro as well.
/System/Library/Extensions/AppleGraphicsControl.kext/Contents/MacOS/AGDCDiagnose -a > "AGDCDiagnose.txt" 2>&1

There're many DisplayPort/USB-C to HDMI adapters. Some are better than others.

Best Mini DisplayPort adapter/cable for 1440p?

Just look for any Mini DisplayPort to HDMI 1.4 adapter or cable (4K 30Hz). But consider a HDMI 2.0 adapter instead for future proofing (or if you have a 4K 60Hz monitor). In the list below, First digit is a version number (1 or 2) Second digit is input type (0:DisplayPort 1:Mini DisplayPort)...

forums.macrumors.com

Things that might affect appearance : scaling (are you using the same resolution in each case?) and chroma sub sampling (this shouldn't be necessary for 1080p).