Urban Fantasy includes two subgenres... one is the "Reawakened diversity" model, championed by Shadowrun. I can't really recommend that mechanically, but the setting is great. Another "in your face" is Castle Falkenstein, a slightly retro 19th C steampunk Urban Fantasy. One can also put the long OOP oWoD relative Street Fighter in this category, tho' it can be played either way... I like the streetfighter setting and the rules play well enough. I'm also fond of CF, but many dislike cards.
The other, epitomized by oWoD, nWoD, Dresden Files, Forever Knight, Buffy/Angel, Army of Darkness, and Night's Edge, and the slightly retro urban fantasies Ghosts of Albion and Vaesen (19thC). GURPS Horror can easily be used to do any of those, as well.
Of those, FK lacks a game. But FK can easily be done with WoD... but they're all one clan. I want to say oWoD Ventrue.
Buffy, Angel, Army of Darkness, and Ghosts of Albion are all fully intercompatible games (unisystem light), so the lack of threat provision books for GoA and Angel is answered with the one for BTVS. Dead tree is 'spensive, but the PDFs seem to have some form of evergreen status with Fox, and they're still up for sale on DTRPG. Note for experienced GM's: This version of Unisystem is "No GM Rolling..." ... the players roll to hit NPCs, and to dodge the NPC's chosen attacks; the NPC doesn't roll to hit, and just uses a dodge score against the player's To Hit. All 4 games do this; if you want to roll for NPC's, remember to subtract 6 from all NPC ability scores...
Ghosts of Albion is "early Victorian age" and is fairly similar to BTVS in tone, but without the overt restriction of slayers needing to be female. I'm not familiar with the books nor shows, just the game. Note that Amber Benson (played Tara on Buffy) was involved with development of the game.
I like Unisystem light, and buffy/angel is a good combo.
Night's Edge is a setting for the Cyberpunk RPG. (ISTR 2013, but I used it with CP2020) Wasn't as good as VTM for me. Dead tree is frightful, but again, it's up on DTRPG for cheap. I'd only recommend it for diehard Interlock system fans.