Used McIntosh MX135 or Marantz 8802

I would not say that McIntosh is better than the Marantz here in this scenario.  I think you would really have to listen to each device to get a sense of what it sounds like. I have had the Marantz AV8804 in my system and was extremely impressed with it (for what it was).  Internally, the Marantz has excellent power supply and overall design.  The major benefit from the Marantz is individual discrete analog output stages for each channel.  The Marantz has an excellent power supply for all analog circuits.  However, it still does use a switching power supply for digital circuits.  The Marantz is voiced on the warm side, and the sound is warm and full with good impact.  If you're looking for a high resolution processor, the Marantz may be a little too warm for you (the high frequencies are somewhat rolled off).

The McIntosh is half-empty inside the chassis (the Marantz chassis is stock full of boards and there is no empty room).  This means the McIntosh uses op amp type analog stages for everything.  You are also buying the expensive glass front panel and features.  The McIntosh might have a cleaner power supply because it uses several stages of heat-sinked regulators.  McIntosh may be higher resolution than Marantz, but I have not heard one directly.

@auxinput
I did not have a chance to look inside of Marantz AV8804, and I trust you on your experience.
Regarding individual discrete analog stages comment, it depends what sort of cap or resistance they are using to make it so affordable. In this case perhaps they are suing a lot of components! Precision on caps and electronic components are immensely important. A cheap capacitor (10 cents or less vs. $40 cap!) value on Farad could vary from 20% to 50% (vs. 2%-4% on good caps!) or more and are very vulnerable toward heat variation on circuit (which makes it less durable devices!). That affects a lot the overall sound and amplification. It is also true with resistances and transistors!

In this case perhaps they are using a lot of components on AV8804! and based on its retail price, I don't think they care too much about high precision caps and resistance and transistors! That affects directly precision on sound quality like resolution, frequency balance, etc...
Obviously, using discrete component in design, avoiding PCB board, leads to a better design and much more precision. But choice of high quality elements is very crucial.

It is also true Mcintosh uses op-amp ICs, I guess they are from Texas Instruments, which has a good reputation on built-in quality.

cheers...
  

@michelzay - yup totally agree with you. However, I have seen detailed pictures of the discrete analog boards (there are like 12 or 13 of them in the 8804). They are very well designed and each discrete analog board has 6 decent sized local power supply caps. It’s almost like looking at the analog circuit of a Bryston or Krell. I would not say they used the best caps (such as Nichicon FG or KW), but they are not using the cheap caps either. So it should be a good mid level capacitor. This isn’t like Emotiva or Outlaw, which does use the uber-cheap 10 cent caps which are crap.

The DAC I/V board on the Marantz is also well designed. It does use a slow slew rate op amp for I/V, but it has massive amounts of local power supply caps to keep the voltage clean and smooth.

Another thing to consider is that Marantz has a HUGE retail distribution / seller network for these devices. They would sell something like 10,000 units, where the McIntosh might sell 200-300 units in comparison, so the retail price is a lot less because they can re-coup the R&D and manufacturing costs better. I’m not saying that this would equal the McIntosh or even something like Krell Foundation, but you are getting more per dollar on the Marantz than you would on the McIntosh or Krell.

I have done an enormous amount of R&D and testing with a large variety of op amps, including the best of the mix (opa627, opa827, ad797). While they can be excellent is a lot of ways, they are all compromised in one fashion or another when compared to the discrete op amps (Sparkos, Burson, Sonic Imagery). So, the discrete analog stages of the Marantz are extremely good for a processor offering at that price point, but like I said, Marantz is voiced warm so you will not have the high frequency resolution and excitement that other devices may give you (which possibly includes the McIntosh MX135).

Just keeping things in perspective.