Blindtext
I am the current maintainer of lipsum, so my answer may be biased in the sense that I know what lipsum can do, and I don’t know blindtext as much. That said…
They are quite different packages, so you can’t really say “this one is better”. They have a very different set of features, so your choice will largely depend on what you want to do. In general:
lipsum is a lot more focused on just returning you the raw dummy text, but giving you control of how much and how the text is output, allowing for some programming usages.
