KDE is considered more configurable, allowing the user to tweak its looks and performance in a lot of ways. 

GNOME, as of now, appears to prefer of providing a crafted UI that 'just works', with few custom themes. It is more opinionated about the arrangement of visual components. 

In terms of performance, as of May 2023 GNOME and KDE are roughly similar, with KDE probably being ahead, and even more so if 'graphics-heavy' decorative features are disabled.
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