The dramas have similar vibes and I loved both a lot! It's the kind of dramas you'll love or hate.

What're the similarities?

The romance is not the main thing, but the chemistry and the leads relationships are mature and deep and kept the viewer captivated till the end. The level of communication and intimacy through words is outstanding, the dialogues can be pretty intense. Not the usual skinship and love-dating-marriage type of thing tho; the love is expressed more with looks, gestures, words, silences, support etc...
The background stories are the real deal in both the titles and to appreciate it well you have to embrace those stories, because the leads are mostly motivated by their own goals.



What're the differences?

-The double is more about personal/family revenge, while TRoP is more about palace struggles

-Even if they both deal with heavy themes, with bloody scenes, the general vibe of The double is "lighter" and has more comical relief moments

-The leads in TRoP are more grey, especially the ML. While in the Double he's mysterious and apparently "cold", his actions are always rightful and clear. In TRoP the ML is darker and it's not always clear what his intentions are.

-The Double is more focused on the FL's story (and her own goals), while in TRoP it's the opposite

-In the Double the couple shows support and trust in e/o throughout the drama, while in TRoP this type of support and trust is not always on point

-The Double has an HE, TRoP has a SE