Set and Horus are rival deities, but for all his scheming, Set seems to have trouble getting the edge over his falcon-headed foe.
The two of them are rivals, 
and they don't get along at all.
.يعتبران ندّين ولا يتفاهمان على الإطلاق
Fetzen
Ambos son rivales y se llevan muy mal.
Ambos son rivales y se llevan muy mal.
Ils sont rivaux
et s’entendent comme chien et chat.
Sono rivali e non vanno molto d'accordo.
Os dois são rivais e se dão muito mal.
Они соперничают друг с другом 
и совершенно не ладят.