I would say 4K, as it was the resolution those with a powerful PC could handle. Everyone had monitors that could do 1024x768 (usually up to 1600x1200) where as

I would say 4K, as it was the resolution those with a powerful PC could handle. Everyone had monitors that could do 1024x768 (usually up to 1600x1200) where as 8K monitors are much less ubiquitous today in comparison.