Which GPU should I use with Lossless Scaling: GTX 1650 or Vega 8?

I’m using a laptop with a Ryzen 7 5700U CPU and a GTX 1650 GPU. Lossless Scaling detects that I have two GPUs: the GTX 1650 and the AMD Radeon Vega 8. Which GPU should I use for running Lossless Scaling? I’ve noticed that for most games, using the iGPU (Vega 8) often provides better performance and image quality. But I also know that the GTX 1650 is technically better than the Vega 8, right? Am I doing something wrong, or is my GTX 1650 just outdated? By the way, are there any other scaling types I should try besides LS1?

Thanks for reading my lengthy post.