You would use Createspace nowadays (for print books) and eBooks are published directly. They were bought by Amazon, and so are well integrated with them. I stopped using Lulu after they went into lala-land, and started recommending scammers like Author’s Solutions.
I would still create epub and mobi versions- plenty of people prefer to read on eReaders. If you have a smart phone or iPad, you can download the Kindle app and read on that. Pdf is a terrible format- it only works on PCs. It’s hard to read a book on your PC. My kindle is very light- I can read books while lying down without straining my wrists, and the battery lasts for weeks.
I tried many tools, but nothing beats Scrivener. It’s not free, but at $40, is very reasonably priced. Though my experience is mainly in fiction.