Conversely, this is a sword sucker. I hope this answers all of your questions regarding the two, but in the event it doesn't, please go to the bottom of this pic for a better description of both.
Both water and sword suckers have their places. Initially, the water suckers seem to be the logical choice; they have lots of leaves and seem full. Swords on the other hand, are sparse, with retarded looking leaves. Looks can be deceiving!
Water suckers will never develop into full sized plants. They probably will not fruit. While not ideal for a fruiting grower, they can be used in areas where you may want a small, bushy banana plant. This may be under your front windows, or along the driveway, or by the street. They also make great gifts. Incidentally, they may produce sword pups in the future.
Sword suckers initially look like rejects but are the strong, healthy plants that will reach great heights and fruit. For ornamental use, these plants will fill in large areas, make a striking accent, or even shade part of your garden if you have sensitive plants.
In the end, it is up to you to decide what to keep. Early on, your plants will most likely produce water suckers, so if you want to fill areas in, they can be used temporarily. As you get more and more swords, you can replace the water suckers with these.
I hope this helps, but I did need to inject a little humor into your thread. You just left yourself wide open... :ha: