PS1 was and likely always will be my favourite videogames console of all time.
It probably helps massively that it was my introduction to videogames, but it goes beyond that.
Everything about the PS1 just worked for me - from the wildly varied launch lineup (I remember getting my console with the demo 1 disk and loving things like Jumping Flash, Battle Arena Toshinden and Destruction Derby) to the big blockbuster hit after hit that landed on it (more on that in a sec) to some of the incredibly experimental titles the likes of which we still don't really see anymore (things like Mr Domino, Rat Attack, Um Jammer Lammy).
I think what worked about PS1 for me is just that I wanted to try a bit of everything, because there were so many games in so many genres that worked for me. So take an 'action-adventure' game like Tomb Raider - far removed from what the series has become, it was actually a fairly sombre puzzle-platformer sim if you got down to it, but that resonates more with me than the set-piece spectacle series it has become.
When I think about my favourite videogames franchises, so many of them started on the PS1; flourished on the PS1 or had their best entries on the console. Things like:
Battle Arena Toshinden 1-3
Breath of Fire III & IV
Cool Boarders 1-4
Crash 1-3 & Team Racing
Destruction Derby 1-3
Final Fantasy VII-IX
Jet Moto 1-3
Jumping Flash 1 & 2
Metal Gear Solid
Ridge Racer 1-4
Spyro 1-3
Syphon Filter 1-3
Tomb Raider 1-5
Tony Hawk's Pro Skater 1-4
Twisted Metal 1-4
Wild ARMs 1 & 2
WipEout 1-3
There were so many trilogies too, in a single generation which wasn't as long as current ones either. Then there's all the hidden gem stuff - things like the console ports of Command & Conquer, Future Cop LAPD, Populous: The Beginning, SimCity 2000, Theme Hospital etc. that I loved, or the titles that no-one remembers like B-Movie, Devil Dice, Harvest Moon: Back to Nature, Hogs of War, Terracon etc.
I never owned an N64, but I would often go around to my friends' houses and play GoldenEye, Mario Kart 64, Mario Party, Smash Bros and other things together. That was part of my experience growing up and I wouldn't change it for anything.
I never owned a Saturn, but I really wish I had. Back then I was a kid and you kinda only got one console and stuck with it throughout the years, so for me it was PS1. I would love to revisit Saturn and N64 games but they tend not to get re-released in terms of the former and only on Nintendo consoles in terms of the latter. I should probably buy a Wii U one day for the N64 classics on it.
I would really love to become a retro collector of Saturn (and Dreamcast) games in the future but I suppose that depends on disposable income availability in future.
But anyway, after much rambling yes - I have a massive soft spot for the fifth gen.