SSD without doubt. That loadings from standart HDD is work killing.
As @Fliptoynk said, wouldn't it wear out while using Daz or is it only when you really remove from your library?I dunno how long do you keep your librariea. Do they have frequent updates? it wouldn't be a good idea to write/erase data too much on ssd as it could wear out earlier than its max life span.
Just a precaution
I'm not thinking about that I have my library on 2 computers so if it dies on one I will tranfer it from second. But I didn't think it will ruin SSD somehow.As @Fliptoynk said, wouldn't it wear out while using Daz or is it only when you really remove from your library?