As far as receivers go, I've got two complete systems with two AZBoxes and also two Openbox S9s. I have an AZ Elite and also an Ultra and the reason for the Ultra was for it's blind scan feature only. Both systems have one of each connected with a diode protected splitter but only boot one at a time to keep my Vbox X dish controller from going bonkers trying to be two places at once!
Those AZs will do 4.2.2 video where the S9s won't but after having an S9 since early last summer, the lack of 4.2.2 hasn't been a problem to date. The AZ has a bunch more features but I find that most of those aren't used on either of my systems, ie, YouTube vid play from the internet for one?? I'll bet I haven't played more than a dozen since I got that Elite 2 years ago. Some do use that stuff regularly though. Down side is that even the "cheap" AZBoxes are now up @ $300 even on fleabay, which I believe is way over priced for a box with what is basically junk firmware that they won't fix.
So, that brings me to the S9 receiver. I use those probably 90% of the time on both systems now and what that means is that if I had bought an S9 before the AZs, I probably wouldn't own any AZBox receivers now since I don't use a good part of the bells and whistles on them. Another advantage of the Openbox S* receivers is price. The two I have were bought used and both work flawlessly and I've got less than $200 in the two shipped to my door. The cheapest AZ I have was $270 shipped. Aother advantage of the Openbox receivers is that there's a couple of companies writing firmware for them so you have another source for firmware, ie, Solomed, Sky Box and Openbox all appear to use the same hardware. There was some new firmware put out back in August that has worked out well for me on both my boxes and made them much easier to use.
And a major note, ALL THESE BOXES ARE A WORK IN PROGRESS!! So don't buy any of them expecting them to be perfect. Many of them were designed for the South American and Europe markets so we're sucking hind teat as far as North American features go. But, with Brazil's crackdown on TV piracy we "may" get a little more attention in the future.
Bottom line is that if I only could have one box now, it would be an Openbox and probably an S9 if I could find it.