If still traveling a lot, I'd definitely go for the 3G/wispernet ones. It's annoying and unpredictable finding wifi spots. I've had zero issues with any of the kindle screens in sunlight or other glare. I prefer Paperwhite (haven't gotten the new Voyager yet) to adjusting airplane overhead lights or personal book lights. I hate that Paperwhite ditched audio features (not a big audiobook fan but when traveling it was nice to load some music on it to white noise what was going on around me or switch to sync'ed audiobook when driving a rental car a boringly long time).
I did not know you can have a music playlist on any Kindle. For short flights, like Vancouver to LA, I often catch up on the one or other magazine (hard copy), on oversee flights, I sleep. So reading books is mostly for when I reach my destination.
I am in tge States, though.
Hope whichever you get works well for you!