I found signing (and titling the image) on the mat resulted in this text being disconnected from the image and lost in the large space of the mat. The solution I use now is a double white mat, with the signature, title, and print number if appropriate on the inner mat below the image, in pencil. The outer mat then frames the inner opening plus artist information. This spacially connects the information better to the image, "frames" it by the outer mat, and still keeps it subtle.
For permanent information on the photograph, I do not print to the edge. Along the very lower edge of the paper, I label the print more fully (signature, title, date, number, and possibly file name) in ink, however this part of the paper is masked by the mats and only seen if the frame is opened.
So I get a subtle title, and a permanent signature & title on the photo itself.