My wife and I received a transplant raspberry plant early in the spring and we were delighted when one of the plants started growing like crazy with a bunch of little flowers. Unfortunately, it didn't spawn any berries! The other plant looks like classic raspberry plants - and is finally growing some berries, but this plant I'm now thinking was just a weed the whole time. (embarrassed)

Judging from the pic attached, does this look like a raspberry plant? Is it just some different variety than the "standard" plant or is it just a weed?