BTRFS is far better designed than other recent linux filesystems. It's just that linux always was and always will be very very buggy. If you want less bugs, use the oldest possible FS that is still usable. That's probably ext2.

Most problems with btrfs is that it fails to mount in many situations and there's no automated fsck to fix it, requiring manual intervention; in fact running fsck on btrfs is considered a very bad thing. This makes it OK for desktop, but not at all suitable for headless servers and other unsupervised machines.

Speaking of bad design, F2FS for example, a filesystem designed for flash drives, keeps both primary and backup superblocks in the same flash erase block. If that block gets corrupted the entire fs is lost.