I honestly didn't watch a ton of live action '90s shows, so I'll do both live action and cartoons (in no particular order.)
1. Goosebumps
I used to watch this a lot when I was a kid and it mostly holds up really well. I think I prefer it to Are You Afraid of the Dark
2. Legends of the Hidden Temple
I didn't watch it when it was airing (I was a bit too young) but I used to watch it all the time when Nick Gas was a thing. One of the best Nick gameshows. The only reason I chose this over Double Dare is because I grew up with Double Dare 2000.
3. Kenan & Kel
The proto-Drake and Josh. And probably the best written of the two.
4. Seinfeld
Not a ton to say. It's a classic.
Absolutely hands down my favorite Cartoon Network cartoon when I was a kid. Genndy is a treasure.
2. The Powerpuff Girls
Second only to Dexter's Lab. It's just too good. I really need to watch it again.
3. The Simpsons
Technically not a '90s show, this was the best era of the Simpsons and no one can tell me otherwise.
4. Daria
I had never watched Daria before college, but oh my god is it amazing. One of the best MTV cartoons (I don't know if I'd call it objectively the best since they're all so different), and really one of the best cartoons of the decade. Hopefully it'll come to Paramount+ at some point.
Live Action
1. Goosebumps
I used to watch this a lot when I was a kid and it mostly holds up really well. I think I prefer it to Are You Afraid of the Dark
2. Legends of the Hidden Temple
I didn't watch it when it was airing (I was a bit too young) but I used to watch it all the time when Nick Gas was a thing. One of the best Nick gameshows. The only reason I chose this over Double Dare is because I grew up with Double Dare 2000.
3. Kenan & Kel
The proto-Drake and Josh. And probably the best written of the two.
4. Seinfeld
Not a ton to say. It's a classic.
Cartoons
1. Dexter's Lab
Absolutely hands down my favorite Cartoon Network cartoon when I was a kid. Genndy is a treasure.
2. The Powerpuff Girls
Second only to Dexter's Lab. It's just too good. I really need to watch it again.
3. The Simpsons
Technically not a '90s show, this was the best era of the Simpsons and no one can tell me otherwise.
4. Daria
I had never watched Daria before college, but oh my god is it amazing. One of the best MTV cartoons (I don't know if I'd call it objectively the best since they're all so different), and really one of the best cartoons of the decade. Hopefully it'll come to Paramount+ at some point.