Across the board, which one of these networks were better in terms of quality shows (based on genre), strength of affiliates, and overall promotion and treatment/scheduling of shows:
http://en.wikipedia.org/wiki/List_of_programs_broadcast_by_UPN

http://en.wikipedia.org/wiki/List_of_programs_broadcast_by_The_WB

http://en.wikipedia.org/wiki/List_of_former_UPN_affiliates

http://en.wikipedia.org/wiki/List_of_former_WB_affiliates

I liked Moesha, The Parkers, and Girlfriends on UPN, and also Everybody Hates Chris, which migrated to the CW. I also liked The Game on CW which is now on BET. I liked Smallville and One Tree Hill on WB, which both also migrated to CW.

The WB in it's prime was a huge part of my childhood.

'90s-'00
Buffy The Vampire Slayer
Dawson's Creek
7th Heaven
Felicity
Charmed
The Parent Hood
Sister, Sister
Unhappily Ever After
Popular
Roswell

'00-'07
Angel
Smallville
Gilmore Girls
Everwood
One Tree Hill
Sabrina The Teenage Witch
Reba
What I Like About You

UPN
Star Trek: Voyager (1995-2001)
WWF SmackDown! (1999-2003)
Buffy The Vampire Slayer (2001-2003)

The WB was much better with normal shows like Parenthood and Steve Harvey

UPN was for GHETTO shows like Moesha and the Parkers

It's no contest. The WB was the better network. I tried to get into UPN but the only shows I ended up watching was WB castoffs Buffy and Roswell. lol

The WB had better shows, including one of my favorite shows, 7th Heaven.

The WB was much better with normal shows like Parenthood and Steve Harvey

UPN was for GHETTO shows like Moesha and the Parkers
There was arguably a time when Moesha and The Parkers were the best sitcoms on UPN, lol.