Best lock for side hinged wooden garage doors
On one door use an inside-only bolt into the ground or ceiling.
On the other side use a &quot;Two point swivel lock&quot; mounted vertically.   This does not require precise alignment of the two doors with each other, and it is much more secure because it uses the door frame and floor for security rather than just the two door edges.  I think it's easier to install and maintain, and I think it will look nice on your doors.   Pictured is a sample, just search for two point swivel lock.
If you want to create better vertical alignment between the doors, you can never rely on big wooden doors hanging from hinges. Add small teflon wedges, one fixed to the bottom edge of the door at the end farthest from the hinges, and the other fixed to the floor beneath it.  The two wedges should be just thick enough to meet and lift the door edge a millimeter or two so as to position it at a relatively precise height.  Then the misalignment will only be caused by vertical expansion of the outer door edge, not by all the other movements of the entire door.   You don't need to do this if you use the locking system I suggest.