In one respect, climbing an ice wall must be easier because your spikes can go into it much easier. Then again, normal rocks can't melt, so there's that. You really want to be keyed into the weather report when you're climbing an ice waterfall. You don't want to be halfway up when Mr. Sun comes out and decides to say hello. One minutes you're climbing. The next minute you're going down a waterslide. When I put it that way, it doesn't sound so bad.
It's amazing that water can even freeze while falling like that. That's a big sign that that's not a place I should be. If waterfalls are freezing then I don't trust my blood not to freeze. I don't care how marvelous the human body is. I'm from Los Angeles. I get cold when it's 65 degrees fahrenheit. I can't trust myself in the wild like that.