Both have..

-female lead involved in superstition / psychic revolations / fortune-telling
-male leads who are seriously traumatized
-logical, calculating and uninterest genius (actual genius in LR, proud in MA) male leads
-SUPER awkward side-couple
-pushy second leads

I personally prefer Lucky Romance, better cast, better storyline, more likable characters and over-all fun and an enjoyable romance.

Madame Antoine's leads had little chemistry, an unclear plot, feelings didn't feel real or important.

Both have..

-Leads enter a contract marriage (of some sort or another)
-leads start off in love with someone else
-female leads are awkward and innocent
-realistic relationships and struggles (not intense or melo-y) that are relatable
-romantic comedy that DOES NOT have an extreme melodramatic dip midway
-quickly(ish) developed cute romance
-an unavoidable occurrence causes conflict

Both dramas have..

-undercover spies that are awkward with emotional feelings
-spies end up have some relationship to an idol
-cute, fun, spunky sidekicks/side characters
-romantic relationships that affect the spies' mission
-fun comedy
-stoic male leads
-male leads' sunglasses give them an unexpected amount of personality that speaks for itself
-female leads use a friend to attract male leads' attention
-unexpected plot development
-fun, enjoyable, romancy

Both have..

-strong-willed, independent women who can fend for themselves
-female lead is proud
-female leads find themselves in unhealthy relationships
-childhood friends
-friends closer to each other than to their families
-mixing platonic feelings with romantic feelings
-characters have unfulfilling lives/jobs
-unexpected plot development (not entirely related to the whole storyline though)
-very attractive actors/actresses
-super cute and lovable romance
-100% worth your time

Both are about musical students making their way in the world and falling in love. Both are based off a Japanese anime/manga.

Spring Waltz is a classic, older dramas and one of the famous Four Seasons. Although CITT is a comedy, it has some darker elements that remind me of the classic Spring Waltz. They're similar in the sense that they male lead id cruel to the female in the beginning and ignores her, making life tough. Later in the drama, they both come to realize they made a mistake and fall for the female leads. Both can be intense and misleading.

Both dramas are about over-protective mothers who go out of their way to do anything for their child and SAVE them. Although Angry Mom has some comedy tied up in it, there is a very dark underlying theme of corrupt schooling, abuse and bullying. Both dramas are MUST watches if you can handle the pain the mothers have to go through to save their children. Highly recommended.

Although these dramas aren't at all alike in storyline or theme, they're both fluffy, fun and light dramas that are feel-good romantic comedies. Both have very lovable male leads who fall head-over-heels for the female lead, both of whom are a bit ditzy, scatterbrained and ignorant in the field of what life has in store for them. Both dramas circle around the marriage theme and the characters' future. Both of these dramas are on my top 10 list and are very worth watching when you're in the mood for something super romancy and heart-pounding.

Both are revenge-based dramas in which the male lead is wrongly charged with murder and returns several years later with more power and tries to ruin his accusers. Both have strong female leads who are determined and can handle themselves without the help of a man. Both these dramas are melos and have a really sweet feeling and can get you sucked into the life of the characters immediately and of course.. both are very enjoyable. Although I must say that I prefered Beyond the Clouds more than I liked Goodbye Mr. Black.

In Time With You and Apple in Your Eye are similar Taiwanese dramas in the sense that they're both stories of two people who have grown up loving each other in a non-romantic form however end up loving each other romantically in the end.
While Apple In Your Eye is about a man and woman who grow up as siblings while the man secretly harbors feelings of romantic love for the woman, In Time With You is about two best friends who have known each other forever and have always dated separately but the man has secretly always been in love with the woman.
Although I can easily pick favorites out of these two, they were both VERY emotional (in terms of feeling for the guy who has loved the girl forever and has to hold his feelings back) and beautiful dramas that showed aspects of friendship, family and love. Both dramas feature emotional male leads for have to face the horror of loving a woman who only thinks of them as family.
Although both dramas are pretty darn good and worth your time, my personal choice of the two would be In Time With You. It was FANTASTIC. Loved absolutely everything about it.