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In general terms, hate is the stronger emotion because of the kinds of damage & negativity it brings to the party.
TS
Love is stronger.
Do you know you are alive because of love?
Wars are won because of love not hate. Love of your way of life is stronger than your hate for another way of life.
I think fear is stronger than hate.
Timi
Love is stronger, but it makes you weaker.
Love is the uphill path and Hate is the downwards one. Once you are at the bottom you can't get back up without a lot of effort, but it's easy to go down the uphill route
Anonymous
Hate is stronger
Halo☽
Since they're opposite, I'll say both are just as strong. Though probably depends on what you mean by "hate", seems to be used to mean dislike more than not.