Which is better ext4 or NTFS, in terms of data security?

The file system there is little independent. You do not make the buggy drive.

Linux does not work well with NTFS, and Windows doesn't work well with ext4, so choose still more on what OS you use.
But in principle, data recovery from NTFS is more likely than with ext4 in the home. But if it comes to that, to be honest the difference in the file system it is unlikely that you will greatly help. Better then to make backups in two different places.

In terms of data reliability, you may prefer to use a regular backup, backup, and clear (regularly check) the data recovery plan.

File system to storage reliability is irrelevant.

Usually if you are looking for TRU solution, the host steval Linux, and the Wines - guest. Therefore, FS will be native for Linux of ETFs.

SIG but the question is, what will You write in extfs with Windows? екст2фсд already know how to write in EXT4?

Which is better ext4 or NTFS, in terms of data security?

Both are quite reliable, but NTFS is probably more reliable still, but this is purely subjective.

The influence of the OS is minimal, because Linux can read NTFS, but windows driver is able ext4.

If you use NTFS - only Windows!!!
If you use EXT4 - only on Linux!!!
If you use EXT4 c Windows, or ntsf with a Linux through curves crutches, what kind of data security can be said???