"Better" and "worse" are fairly subjective measurements of the arts. That said, you may be interested in these previous threads from our FAQ on realism in visual art:

https://www.reddit.com/r/AskHistorians/wiki/art#wiki_why_wasn.27t_ancient_art_realistic.3F

The FAQ is generally good on this topic. I'm an art historian, though not a medievalist, and would be willing to attempt to answer any further or follow-up questions you may have.