I would pick my Tiberius too, lol.
He's a great old guy. Due to a little fin damage he sustained at the pet store, though, his fin grew in ruffly and sometimes new pieces grow so crooked they lose circulation and become necrose--so this fish needs special care to avoid infection.
And due to his plain color (common, but I LOVE extended red) he'd probably be the hardest to rehome.
It would also be super hard to give up Valerian. I would hide him under my bed--he's my oldest boy and I watched him change from mostly white to black with blue metallic. His eyes appear foggy due to the metallic gene on the surface of the eye.
Since he's a rosetail and a bit more unique, he'd be easier to rehome, though despite being an oldie.