It's a draw, since I hated both. Main reason being, that both had creepy enemies that followed you around with a stressing tune playing. And I friggin' hate enemies that follow you like a shadow, so... Twilight Realms=Zant's hands, Silent Realms=Guardians. As I voiced my opinion, I disliked both. And both of them were horribly desinged. Twilight Realms... It was just a huge castle. I was extremely disappointed, since I had been excited about it, and was eagerly waiting for an entire new world bathed in the eerie glow of twilight, all new areas with serene beauty, enemies never seen before... But all I got, was a castle. (There might've been other areas, which is most likely, but they were never introduced...) Seriously Nintendo? But you can't have it all, I guess. And Silent Realms were just spirit- like versions of the actual provinces in the game, so, I guess that's not something so EXTREME and SUPER and otherwise AWESOME, and something someone would go all 'loco' about.
But to put it shortly, I hated both of them. I know, that 'hate', is a strong word, but it's true.
And by Twilight Realm, I thought we were talking about the area past the Mirror of Twilight. Oh well.