[hobnail]

For me, even if the Forma's screen was the same size as the Oasis's I'd still prefer the Forma because of its user interface. Looking at your books in My Books it can group them by author, series, and collections. In the plain ungrouped mode you can sort them by recent, date added, title, author, series, file size, and file type. For the authors group you can sort by last name, first name, recent, and number of books. And so on.

Series is a new thing, previously we used Collections.

The larger size is nice but I can't say that I notice/miss it that much when I put a book on the Oasis to see how it looks there. I mainly find using a low contrast font helps; e.g. Bookerly and Caecilia. (A low contrast font doesn't have as much difference in the thickness with the thin and thick strokes and has blunter serifs.)

I also buy my books from Amazon and use Calibre to transform them to EPUB.