The Kindle Oasis is probably large enough at 7" to make it work. If you're reading PDFs, you probably want something that's 10" or so -- I believe Kobo's Ellips

The Kindle Oasis is probably large enough at 7" to make it work. If you're reading PDFs, you probably want something that's 10" or so -- I believe Kobo's Ellipsa fits the bill. Or you could end up in-between with a Forma or a Libra, which I believe are both 7.8". As someone who used a 6" e-reader for years and switched a few months ago to a 7.8" e-reader... it makes a massive difference. Technical material is actually readable on the larger screen, the CPU is faster so I can actually search larger texts in reasonable time, and PDFs display pretty well (though still a bit small). My advice: go with 7.8" if you want to read fiction and carry it around a lot, but also want to read some technical material. If you just plan on writing notes and reading technical stuff, 10.3" is the way to go.