PlayStation 1

1. Final Fantasy IX

2. G-Darius

3. Grandia

Honorable Mentions. Xenogears. Strider 2. Wolf Fang. Einhander. FF7. 

PlayStation 2

1. Zone of the Enders 2ND Runner

2. God Hand

3. Gungrave

Honorable Mentions. DMC. DMC3. Neo Contra. Gradius V. Shinobi. Nightshade. Okami. 

PlayStation 3

1. VanQuish

2. EX Troopers

3. Strider

Honorable mentions. Binary Domain. Metal Gear Rising. Dragon's Crown. Dragon Age Origins. Kingdoms of Amalur. Transformers Fall of Cybertron.

PlayStation 4

1. Assault Suit Leynos Remake

2. Nex-Machina

3. Yakuza 0/Nier Automata

Honorable mentions to ZOE2 HD. Metal Wolf Chaos. Bulletstorm Remaster. DMC5. Ruiner

PlayStation 5

1. GunGrave Gore

2. The Ascent. 

3. Stellar Blade

Honorable mentions. Cyberpunk 2077. Evil West. Prodeus. Raidou. Scarlet Nexus. SMTVV. Soulstice. 

PS1:
MGS, FF7, Crash Team Racing.

PS2:
Shadow of the Colossus, Devil May Cry, Zone of the Enders 2.

PS3:
The Last of Us, Uncharted 2, MGS4.

PS4:
Bloodborne, Sekiro, NieR Automata.

PS5:
FF7 Rebirth, and then it's close between GT7, Unicorn Overlord, Astro Bot, Trails in the Sky 1st Chapter, and Where Winds Meet.

PS1:

1. Final Fantasy IX
2. The Legend of Dragoon
3. Final Fantasy VIII

Honourable mentions: Final Fantasy VII, Grandia, Suikoden II

PS2:

1. Shadow of the Colossus
2. Final Fantasy X
3. Persona 4

Honourable mentions: Okami, Final Fantasy XII, Kingdom Hearts 2

PS3:

1. Dark Souls
2. Valkyria Chronicles
3. The Last of Us

Honourable mentions: Metal Gear Solid: Snake Eater (I've only played the HD remaster, never the PS2 original), Trails of Cold Steel 1&2, Dark Souls II, Uncharted 2

PS4:

1. Bloodborne
2. Dark Souls III
3. Horizon Zero Dawn

Honourable mentions: Nier: Automata, Uncharted 4, Valkyria Chronicles 4, Trails of Cold Steel 3&4, FFVII Remake, The Last of Us Part II, Tales of Berseria

PS5:

1. Elden Ring
2. Horizon Forbidden West
3. Clair Obscur: Expedition 33

Honourable mentions: FFVII Rebirth, Astro Bot, A Plague Tale: Requiem, Trails in the Sky 1st chapter, Demon's Souls, Final Fantasy XVI

PS1
Crash Bandicoot 3 Warped
Looney Tunes Sheep Raider
Yugioh Forbidden Memories

PS2
Ape Escape 2
God of War 2
Sly 2 Band of Thieves

PS3
God of War 3
Sly Cooper Thieves in Time
Dark Souls 2

PS4
The Witcher 3 Wild Hunt
God of War Ragnarök
Crash Bandicoot 4 It's About Time

PS5
Baldurs Gate III
Clair Obscur: Expedition 33
Elden Ring

Oh, tough one.

ps1: FF7, FF Tactics and RE
ps2: GoW, Colossus and Sly 2
ps3: Demon Souls, Dark Souls and Dark Souls 2
ps4: Bloodborne, Dark Souls 3, god of war
ps5: nothing, went PC, lol. but would have put spider 2, ragnarok and forbidden west

I took the top 3 from my top 50 games list. In terms of top 3 only PS2=PS1>PS4>PS3>PS5. In terms of sheer numbers PS2>PS1>PS4>PS5>PS3.

Unranked: FFVII Remake PS5 and FFXVI PS5
40: Uncharted 2 PS3
36: Metaphor: Refantazio PS5
31: Bioshock PS3
29: Persona 3 Reload PS4
25: Infamous 2 PS3
22: Nioh PS4
19: Nioh 2 PS4
10: Digimon World 2 PS1
6: Romance of the Three Kingdoms IX PS2
5: Dynasty Warriors 3 PS2
4: Digimon World PS1
3: Final Fantasy VIII PS1
2: Final Fantasy X PS2

Well, he said your top 3 games on every PS console, he didnt specify that they had to be played by you on PS consoles lol

PS1

1: Final Fantasy VII

2: Metal Gear Solid

3: Castlevania: Symphony of the Night

PS2

1: Final Fantasy X

2: Tekken Tag Tournament

3: Devil May Cry

PS3

1: Uncharted 2: Among Thieves

2: Ultra Street Fighter 4

3: Bioshock

PS4

1: Resident Evil 2 (Remake)

2: Devil May Cry 5

3: God of War 

PS5

1: Clair Obscur: Expedition 33

2: Resident Evil 4 (Remake)

3: Final Fantasy VII:Rebirth

There's some favorites that are available on PS platforms that I didn't include because I didn't play those games on PlayStation (like the original RE4 for instance)

Got into gaming in 2003 with the PS2, so no PS1 for me.

PS2-
Shadow of the colossus
God of war 2
Resident evil 4

PS3-
The last of us
Red dead redemption
Uncharted 2

PS4-
Uncharted 4
God of war
Red dead redemption 2

PS5-
Astro bot
Horizon forbidden west
Ghost of Yotei