Considering the userbase, everyone formats using NTFS (if they want files more than 4GB), so itβs de facto standard due to the sheer quantity.
ExFat is great cross-option, though, without the limitations of fat32.
Android SD cards userbase is probably comparable or even bigger nowadays. And those use fat32 or exFAT AFAIK.
I'd guess not since big G has been on the push to abolish external storage - and I wouldn't blame them, really hard to put data (especially application data) on hotplug removable storage.
The camera world has been using exFAT since quite a while.
ext3 is way more portable... even under *BSDs
.. "NTFS... de facto standard"? ... from M$ lolz
Ext3 sucks under BSD's, a lot of them can't write to the volume, doesn't matter either EXT2, 3, or 4.
UDF as I stated works fine with udfclient under OpenBSD and it could be "mountable" even with base tools (read /usr/local/share/doc/pkg-readmes/udfclient in order to correctly format it with udfclient).
I copied files back and forth on USB drives written in under OpenBSD and the volumes mounted like magic under Linux. And the performance is not bad at all.
I will give a try to UDF -esp if has comparable write speeds with ext3 , but for sure I had no issues to _write_ on an external ext3 with NetBSD + FreeBSD (my last desktop OS, before move to Debian Sid)
NTFS is pretty much limited to internal drives on Windows PCs.