I'm not really interested in either of them. They're both outside my niche. But if I were going to try one of them, it would probably be the Necromancer. I really don't need dead bodies to move -- I'll just spawn a new one where I want it to be -- and I think the idea of undead just crawling out of the ground to get in the way of things is a more interesting idea than "boatload of minions". I know it's not the fantasy that people may have, and maybe in practice it won't be as interesting , but right now my curiosity is piqued, and my imagination can work with this.

I also think it makes more sense from a ludonarrative point of view. PF2's zombies still move pretty quickly, and can have a somewhat explosive action economy (shamble, shamble, multiple strikes, shamble, shamble). Thralls, instead, are moving and reacting more slowly than once every 6 seconds. It's very easy to forget that a round is only 6 seconds when actually playing, but the "army of undead" that appears in the mind's eye is often moving around at less than a foot per second, so they kind of fall beneath the threshold for... well, for play.

I like the runelords in PF, they've always been kinda goofy being wizards with big polearms though. Having an actual class to back up their aesthetic makes me happy. Also, one of my group's members pointed out the similarity to Deathknights in Warcraft, and I kinda wanna make that happen.