My NAS can hold several 3.5" hard drives and an SD card. I'm planning to boot and run a custom Linux system (based on Debian, built by me) from an SD card, and the 3.5" hard drives will be used for data storage (and possibly log files). The SD card has a sequential read and write speed of 90 MB/s.
Which Linux filesystem should I use? Is there a filesystem which provides better speed and longer hardware lifetime (if there are many log file writes) than ext4?
What are the recommended ext4 creation and mount flags for SD cards?