FWIW, I recently analyzed most of the options out there. I'm in the process of finishing my switch from Dropbox, mainly due to their lack of transparency. Here's the summary before my writeup is published:
- my needs aren't that great (all my music is stored at Amazon, photos & videos at Google photos)
- I have a local NAS for local backups
- 99% of my files don't need encryption, I'll use BoxCryptor for encrypted directories
- I'll keep Dropbox and the free 2G of space for apps that only sync via this service
- must work with Linux, NOT via webbrowser
- selective sync
I evaluated: iCloud, Tresorit, Spider Oak, Sync.com, SyncThing, Google Drive, Box.com, and pcloud.
I'm probably going with Google Drive due to cost (24/y 100G, I only use ~20G right now), Linux support, and ubiquity.
Tesorit is probably the best solution, but it's also ridiculously expensive: $30/m for 1TB when pretty much everyone else is $10/m for 1TB.
pcloud was a close second place, and this is probably your best choice, but you have to pay extra for the pcloud crypto extension (15/m 2T). From what I can tell, you tell it what to sync instead of working out of a directory which seemed wrong, but I may look closer before finalizing my switch.