IMO- Ortlieb panniers are simple, durable, relatively light, and waterproof. My rear panniers have between 12,000 and 15,000 miles on them. I experienced 35 days of rain during the tour these pictures were taken. Those panniers and bags are waterproof! They have been carried as checked baggage on buses, trains and planes, survived a few not so insignificant crashes, and suffered the normal wear and tear of touring. All my Ortlieb gear is still in excellent shape after a lot of use.
Their clean profile also make them easy to load into the various cargo bins and overhead compartments
Organization is not a problem for me, but that is an individual thing. Some people are organized with anything and some folks have problems regardless of the number of pockets. I don't like panniers with a bunch of outside pockets, but again that is a personal thing.
Different tour, but almost as wet.
In the end we get what we think will work for us. It is not an irreversible decision. Good luck!