I personally recommend the CreaturePack zombies. Many of them are really good.
Of course, some of them are not so good. If your tastes agree with mine, you might want to take a look at a modlet I created. It removes some types I don't think are appropriate, and adjusts others:
https://gitlab.com/karlgiesing/7d2d-a19-modlets/-/tree/master/0-CreaturePackZombies_khzmusik_Adjustments
If you don't agree with me but still want to adjust things in the CP zombies, you can use that as a learning aid if you like.
I also put together a zombie pack that uses UMA, like the EN zombies (and also the Snufkin zombies but those definitely won't be to your taste). It's just zombie variants of the vanilla archetypes (Hank, Emma, etc.) so you may be interested:
https://gitlab.com/karlgiesing/7d2d-a19-modlets/-/tree/master/khzmusik_UMA_Zombies
But UMA zombies are significantly less performant (and also IMHO uglier) so I would start with the CP zombies.
(These are all in the Mod Launcher if you use that.)