Well, I started with GTX 1080 (ran on it for about a year), then I bought two 2080ti. Unfortunately, I chose Gigabyte cards and encountered a very unpleasant overheating problem. Which I have had for over a year now, and which makes me have to undervolt them. For rendering static images it's enough, but for animations it would be nice to have something more powerful. I didn't see much point in swapping them for a 3090ti, though. 2x2080ti are roughly equal to one 3090ti, so I've been waiting for the 40 series for a long time. I'm pretty sure they'll be out by the time I start working on my new project, and then the work will be a lot more enjoyable.
As for VRAM, I really lack it. Right now I'm making a special render with 8 characters in 4K resolution, and in order to keep my PC from dying, I have to render the first 4 characters at one pic, then the other 4 on the second. Then go to photoshop and make it into a single picture. Surely, with a 3090ti, I wouldn't have this problem. And with the 4090ti... Well, there should be plenty of extra VRAM.
I do my animations in Daz. It's awfully inconvenient, but I'm used to it.