I would keep the small single. It's more versatile with the strap.
Would you still keep it if you had other crossbody bag options but not that many clutch options?
I'm admittedly not a clutch girl or a fan of blush with gold hardware, so I'd go with the single, if it were me. Since it's not, does either one fill a color void in your wardrobe? Do you prefer the Eugenie to your other clutches or the single to your other crossbody bags? Which one do you see yourself getting more use out of?