There are three main outfitters that run trips in Ecuador: Small World, DeReimer and Endless. To have that line up of professionals to chose from in one country is increadible as the credentials for each is amazing. All three arrived in Ecuador at about the same time. And all three have worked very hard to create a great experience in Ecuador. I would never hesitate to recommend Phil & Mary or Larry to someone we could not accommodate as I know they would be well taken care of. Regardless of which of the three you chose (and sometimes the decision boils down to who is running a trip at the time that works best for you) you will have an amazing time in Ecuador.
To share a little help with traveling here are a couple of reference pieces...
in addition all three outfitters have blogs
and they work really hard on them all winter long. If you will not be traveling this winter, you can still vicariously paddle along!