Reasons can include any reason.
The music during, the presentation, interactivity during....

Anyway

Try to avoid spoilers if credits include them, such as my first example...

Nier Automata's final credits sequence.

Doom 2016's credits sequence is really awesome too

Transistor

The ending credits anyway, specifically for the song coupled with the final events of the game. Gives me chills.

My favorite is probably Shadow of the Colossus, as said credits sequence is also the final cutscene of the game. It's as spectacular as the rest of the game, and the music during it is absolutely phenomenal - my favorite piece of the entire soundtrack, The Sunlight Earth, starts as the hawk starts to fly away from the temple. It's so fucking good.

Devil May Cry 3 has a cool credits sequence too since you just fight endless enemies during it.

Also, special mention to Okami's credits, but specifically on PS2. The theme that plays during this is "Reset," and it's fantastic. But unfortunately, rights to this song were apparently lost later on. Every later version, from Wii to HD, has a completely different credits theme. The credits presentation is otherwise nothing particularly special, but it is pretty stylish just like anything Okami should be.

Also the credits theme for Fatal Frame 2 is AMAZING

Same with the theme for Silent Hill 1's credits

actually nvm this is my real answer:

https://www.youtube.com/watch?v=d1nDafqdH9o

really wish i could EMBED THIS VIDEO

Donkey Kong Country 1 and 2.

Showing all the enemies and stuff, and the music is good.

Chrono Cross's ending song is amazing.

Nier 1 has a great song.

I know Thyme can vouch for this.

Space Channel 5 and Space Channel 5 Part 2:

Sit through 5 minutes of credit to get one last command to get a perfect score (while chances are you're in the bathroom or kitchen.)

Up!

Quote from: Samus Aran on August 14, 2018, 11:12:28 PMactually nvm this is my real answer:

https://www.youtube.com/watch?v=d1nDafqdH9o

really wish i could EMBED THIS VIDEO

wtf is this lmao

Star Fox and Star Fox 64 tbh

Quote from: Thyme on August 15, 2018, 07:04:02 PMStar Fox and Star Fox 64 tbh

This is good answer

Quote from: Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo on August 15, 2018, 03:35:27 PM

Quote from: Samus Aran on August 14, 2018, 11:12:28 PMactually nvm this is my real answer:

https://www.youtube.com/watch?v=d1nDafqdH9o

really wish i could EMBED THIS VIDEO

is this lmao

the canon ending for silent hill 2

How has Melee not come up yet
Ico is also a good one.

Quote from: Thyme on August 15, 2018, 07:04:02 PMStar Fox and Star Fox 64 tbh

star fox 2 too

[youtube]https://www.youtube.com/watch?v=xnB98ENrZO0[/youtube]

[youtube]https://www.youtube.com/watch?v=IPXtir65p40[/youtube]