Which is worse, selfish cheaters or vengeful cheaters (aka revenge affairs, cheating back)?

A couple relatives in my family cheated on each other. The first cheater did it for whatever selfish reasons they had and got caught. Meanwhile the 2nd cheater did it out of revenge, in anger and it was all planned out, calculated with full intention of hurting them.

If you had to take your pick, which cheater would be worse? The selfish cheater or the vengeful cheater?

Selfish cheaters
Vengeful cheaters
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Which is worse, selfish cheaters or vengeful cheaters (aka revenge affairs, cheating back)?
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