These days there isn't really any reason to avoid btrfs. It's stable, and has a lot of nice features.

I would say, if you want benefit from the features of BTRFS, then go for it. But you have to read a bit what it can do, and use tools and set it up to get the most out of it I think. EXT4 on the other hand is proven and is a setup and forget experience. I chose EXT4 when installing EndeavourOS, because I read a few things about BTRFS that made me think twice and also I don't need the features too. So, if you don't know and have to ask the community, then the best would be to us EXT4, unless you know why you want to have BTRFS features.

I would recommend btrfs at this point. I use it for my OS harddrive and I would also use it for my second harddrive except I don't want to format it, so it's still running ext4.

Theoretically btrfs runs slower then ext4 but you won't see it outside of benchmarks. Btrfs can also do integrity checks and healing so your drive (might) last longer, ultimately, that one depends on what exactly is wrong with it.

I spent my weekend driving out to my grandparents place to fix her BTRFS partition on her laptop. This is after I had a complete partition failure on a brand new hard drive last spring, which has since been running just fine since with ext4. Make of that as you will.

A beautiful picture I took in the process

Ext4 has been rock solid for me.

BTFS snapshots are such a huge improvement and a live saver if you like to tinker on your system. Also great for backups, which you should make. Use snapper and similar tools.

I’d only recommend ext* for spinning hard drives. For ancient slow machines, go with XFS or ReiserFS (if any distro still supports that even).

Dual-booting, so I'm stuck with ext4.

I have experienced both cases where btrfs mounted read only for no good reason and cases where ext4 did not detect my storage medium had corrupted my data. I have chosen btrfs for data integrity but both options have upsides.

ext4 is faster, I always use it for /

As for data I use btrfs because it has checksumming and it can detect corrupted files, while ext4 just lets you copy a corrupted file to your backup.

I've had some issues with btrfs, in the past but was many years ago, probably not relevant anymore.