No benefit, unless the additional file resides on a different (physical) disk and the sizes of the data files in the same filegroup are identical.

You should grow the files manually before available space becomes a concern and use autogrow for unplanned growth only.

Autogrow by 10GB is too big. I would use smaller autogrow amounts, such as 100 MB. Also, make sure you enable instant file initialization, or SQL Server will have to wait for the allocation of the space in the file system (especially for big autogrow amounts)