Moby Wrap - Made from 100% cotton knit fabric (think quality t-shirt material), approx. 6m (6.5 yards) long , approx. 60cm (24") wide tapered ends, serged edges, comes with written instructions. The Moby is manufactured in Thailand by an American company. (The owner's father lives in the village where the wraps are made, and they use fair labour practices.)
EllaRoo - Made from 100% hand-woven cotton, 4.3, 4.6 or 5m long, approx. (27") wide, fringed ends, comes with written instructions. The EllaRoo wrap is manufactured by a cooperative of weavers in Guatemala using fair labour practices. The threads are all dyed without toxins or heavy metals.
Hard question as to which is better. I love them both, and will reach for a different one depending on my mood/need. The EllaRoo is much prettier, so I will reach for that when I want to make a statement. It's also a better option for back carries (though I usually use my Ergo in that case). And I suspect I will use this one more often in the summer because the fabric is lighter weight.
The Moby Wrap is better under a coat because the edges are serged and less "firm" and don't dig into my arms, so I've been reaching for that one a lot this winter.
I don't think you could go wrong with either. Good luck in your decision!