Depends what you like..
Personally I think the Cartier clash is an edgy but elegant "hoop" style earring and can be very easily worn as an everyday piece. It's a design that will stay relevant forever.
The Tiffany hardwear is quite a standout design and very stylish.
I've had my eyes on the hardwear earrings for quite some time now, but not sure if it's a design that I will continue to love 10 years from now, or is it because I'm influenced by trending things now.