Sorry , had to  google the meaning.  I have not yet watched any Thai dramas so will not be able to answer.  I will look at the Best suggestions and take a look:)

Best:

Kluen Cheewit

Leh Nangfah

Game Sanaeha

Worst:

https://mydramalist.com/13864-roy-leh-sanae-rai


Drama with Poor Female Lead 

Best:  

100 Days My Prince

Heirs

Worst:

My Absolute Boyfriend

Drama that has time travel / flashbacks 

Best:

Goblin,The Untamed ,Prison Playbook

Worst:

Man to Man


Dramas with cute side/second couple(s)

Best:

1. Descendants of the Sun
2. Goblin

Worst:

Cinderella and The Four Knights

Best and worst medical drama

Best medical drama :

1. Doctors

2. Yong Pal

Worst medical drama :

Emergency Couple

Best and Worst drama with twin as the main character

Best:

  • Day and Night
  • Queen SeonDeok
  • MARS

Worst:

  • Cinderella Man


.. dramas with Best friends Falling In Love?

Best:

  • In Time With You
  • Fifteen Years to Wait for Migratory Birds

Worst: 

  • The Time We Were Not in Love

dramas with tragic endings

SPOILERS

Best:

Cruel City

Battle of Changsha

Worst

Siege in Fog


Dramas with a strong friendship theme

Best

Failing in Love 

Worst

Boys Over Flowers 

Dramas with vampires 

Best

Vampire Prosecutor

Worst

Orange Marmalade

Blood



.... Sports Dramas

Best 

Weightlifting Fairy Kim Bok Joo

The King's Avatar

Worst

?

Dramas with love triangles

Best:
-You're beautiful
-Someday or One Day

Worst
-Boy's over Flowers

Best and Worst medical drama

Best:

- Romantic Doctor Teacher Kim 2

- D-Day

Worst:

- Doctor Stranger

- Doctors (i.e. Doctor Crush)


Fantasy dramas