@super365
Add on to comments by dexter9898...
Stb like AC Ryan has display setting which allows for adjustment of brightness, contrast, hue, saturation and sharpness for fine tuning of "picture quality", if this is what you meant by picture quality.
For stb such as Draco 7100 without such feature, the video output setting is determined by the chips and probably firmware employed. The video output across different stb may not be identiical.
As for "reception quality", which means either you see the video displayed, pixelated, frozen or no picture at all, it depends on the tuner's (either built-in or external) sensitivity. You may have a good location and sensitive antenna. But if the received signal is below the sensitivity (threshold) of the tuner, you would not be to watch the video. This is called the "cliff effect". Below the cliff and you see nothing or pixelated, frozen pic; above and you see "perfect picture".
Edit: Btw, I found Draco has better sensitivity than AC Ryan.