Good day! Based on the specifications you provided, it seems that your system meets the minimum requirements to run Baldur's Gate 3. However, it's important to note that the game is still in early access, and its system requirements may change as the development progresses.
Based on your hardware, it seems that Baldur's Gate 3 should be playable on your system. Your Ryzen 2500u processor should be sufficient, and your 8GB of RAM should also meet the minimum requirement. The RX560X 4GB graphics card should be capable of handling the game, especially considering you can run Red Dead Redemption 2 at 1080p Ultra settings.
In terms of which game is more demanding, it's difficult to say definitively. Both games have different requirements and optimizations. However, given that Red Dead Redemption 2 is a more recent and graphically demanding game, it's possible that Baldur's Gate 3 may be slightly less demanding in comparison.
Ultimately, the best way to determine if your system can handle Baldur's Gate 3 is to check the official system requirements or try running the game on your system. Keep in mind that early access games may still have performance issues and optimization problems that can affect gameplay experience.