48 is a 40mm steel case auto. 176 is a 44mm Ti case hand-wound. Very, very different choices. I find the 44mm HW fits closer to the wrist and more comfortable than the 40mm autos. The 44mm HW is more "historic" and more representative of the Panerai brand, so it would be the one I would favor of the two, but that's just me. Plus, I like the lighter weight and darker mat grey of the Ti.
hey thx for your promt reply. any other panerai u suggest i should look at