At the risk of being (correctly) accused of stating the bleedin' obvious, smoked gammon tastes 'smokey', whereas unsmoked gammon doesn't. It's entirely a matter of personal choice. I love smoked bacon, smoked cheeses, smoked (cooked) turkey breast, smoked haddock, smoked salmon, smoked trout, etc, etc. So you can probably guess which one I'd choose! (Putting my personal preferences aside though, I'd still say that smoked gammon, with pineapple, would offer a better contrast in flavours than using unsmoked gammon).
If you'd like to make it a little 'posher' (but still keeping things fairly simple), try this:
http://www.bbc.co.uk/...d_gammon_steaks_29043
Chris