I would be surprised if the 730 fits you. It is not impossible but I would make sure before buying. I am 5'10" but have short legs, and most 19.5" frames are just a little too big. The giant seems in good shape too and might be a better fit. The tires will probably need to be changed for commuting but that is not a huge deal. The same with a rack. Personally, you probably need to test ride the giant and find out what you think between the two.
Bruce

edit- Steel you posted while I was typing... good luck with the test ride!