Since no one else has given you the real answer I will chime in. There is a big difference between what you can cut on a vertical and a horizontal band saw.
The horizontal can cut an infinite length of material in both directions. For example you can cut a 20' long piece of angle iron in half. The limitation is the width of the piece, often only 4" on a small horizontal. You can not cut a 20' piece in half on a vertical.
The vertical saw is limited on one side (a 16" Doall is limited to 16" on one side but infinite on the other side) but it can cut an infinite width of material. This make the vertical ideal for things like plate or sheet metal that will not fit a horizontal saw. On a 16" Doall you could cut a 16" strip off a 4'x8' piece of 12 ga sheet metal. Of course what you usually need it for is something like cutting a 12" x12" piece of aluminum plate or sheet metal.
I can,and have, cut a 20 ft piece of angle in half on a vertical bandsaw but the cut ends will be at about 30 to 45 degrees.