suits will always comes with a dust cover and hanger. As for between Prada and Hugo boss, I will vouch for Prada. Alteration is chargeable when bought during sale. As for Prada suits whether will be on sale, yes they do but only for seasonal items. Just like their bags.
If you are more of tall and lean body type, you can also try Dior Homme suits. Jil Sander suits are pretty decent as well. Good cut, good quality and workmanship. Make a visit to club21 at 4 seasons hotel. They have variety of labels and they always carry suits since a lt of their clients are affluent working adults. And of cos if they have your sizes, Balenciaga suits are really sexy. At least for me.