Hello my frieds

I am a psychologist and do a lot of reading. With my university account in Austria I have around 100 big PDFs for studying in the future, some of these books would cost 100 Euro, so I decided a good ereader is worth it. Plus some of the books are close to 13" with >1000 pages, so a normal sized ereader wont do. I dont want to wait for all the other 13" devices so theres only the option of onyx boox max vs Sonys digital paper. Ive got some questions about these devices, perhaps you can help:
1. Any easy way to buy one in the EU? Ive only seen the ereader-store.de, do you know if they have the max in stock right now? (looking at you booxtor

)
2. Which are the specific Pros & Cons if you compare these two? What I know so far: I dont need the playstore and I dont need 16gig (my folder with ~100books is only around 1gig). I am not sure about the touchscreen, is it important if you just want to read?
3. Which one would you buy?
thanks