Getting Real was written almost 10 years ago, and it talks about the same things as most recent Remote. So you can skip it. However Rework, and Remote are definitely worth to read. They present the new(?) approach for work, and productivity.
Rework focuses on pragmatic ways to improve your (and your company) productivity.
Remote presents how remote working can be applied in your company. All Basecamp employees are remote workers.
Of course authors present ideas that works for them, and may not necessary work for you. However, I am sure you will appreciate more than one of their advises.
This is one of my favorites quotes from Remote:
Both Rework, and Remote goes to my favorite books list.