Honestly, I would say go with the Stihl or the Husqvarna.
The problem with buying JD handheld products is that they don't make them. As mentioned in an earlier post echo has made alot of products for them in the past, but JD does not handle the parts for the items they sold that were built by echo any longer. We have an good JD dealer in our town, but they have to send all the customers to the local echo dealer for parts. there is no problem with that, because there are echo dealers everywhere, but that is the key.
5-10 years from now you will have a tough time finding efco parts to repair your saw with. Efco will still be in business, but they have a very small dealer network.
By the Stihl or Husqvarna and you will need not to worry.