Nano Banana has a significant architectural advantage. Seedream and Qwen exhibit high frequency artifacts throughout their images due to fixed patch sizes in their transformer, RoPE, and VAE components. (16x16 for Qwen, 4x4 for seedream) These models cannot produce clean or more important high fidelity outputs. Nano Banana operates directly in pixel space that means if you are working with input images your images don't get degradged because of the VAE roundtrip and your t2i are not riddled with high frequency noise. That's the advantage of nano banana. Resolution is not an indicator for quality.