Edo Tensei Chakra:
When Madara was Freed from the Edo Tensei Covenant he Stated that Edo Tensei's have and Infinte Amount of Chakra. People have Taken this to mean that And Shinobi Resurected With Edo Tensei can Spam Jutsu's and make them much more powerful that they normally would.
This is False, While The Edo Tensei Bodies do have an unlimited amount of Resouces from which to make chakra they cannot Knead or release more chakra than there body could before resurection (or however much their body could in the state it was ressurected in.
I Base this on The Fact that Muu was incapable of Using Jinton after being split.
After Being Split the amount of chakra he could release/Knead was effectivly cut in half.
Further Proof on the fact that only a certain amount of chakra can be kneaded/Released by any certain person is proven by Naruto's Learning of the Rasengan. He had to Train his Chakra Ciculatory System to Knead more chakra and Also be able to release and sustain more chakra (the Second Step of the Training is an excellent example)
So In conclusion, Yes Edo Tensei Bodies have the Resouces to Continously Make Chakra, Yet the ninja Cannot Knead/Release more chakra than when they could in their life.
Preta Path has the ability to Abosorb Ninjutsu and Render them useless. This is done by taking in the Chakra and spinning the chakra until it is steralized (this is stated in the databook but i couldn't find the page to save my life) The Chakra does not go to the Preta path users chakra reservers but instead literally becomes nothing (for the lack of a better of a better way to put it)
I find that this is done by opening the Tenketsu and allowing the jutsu to flow into the user's Chakra Ciruclatory system (The opposite of Kaiten in a way) The Chakra is then Spun until it becomes sterile.
Now there's Two Factors that dictate how much the user can Absorb and how fast they can absorb it.
1. The Amount of Chakra that the User can Knead/Release
2. The User's Skill in Chakra Control
The Amount of Chakra that the User Can Knead/Release Dictates the amount of Chakra that The user of Preta Path can allow into their Chakra System at one time. Chakra being absorbed must be spun and sterilized to allow more to enter the system, This is where the User's Skill in Chakra Controll comes into play. The user's Chakra Control Dicates the Speed at which they can spin the absorbed chakra and therfore means that the better chakra control they have the faster they sterilize the absorbed chakra. The Use of the Barrier when using Preta Path means that the user has either worse Chakra control or cannot Knead/Release as much Chakra as one that does not have to use the barrier. Meaning that the path that used preta in the six paths of Pain cannot absorb as much chakra as Madara or Nagato.
By my own Opinions, Calculations, and Assumptions on the above i will give what i believe to be the end of the "Preta vs Bijudama" Debate.
This is done from the persepctive that the Preta user is standing still with absolutly nothing in the way of Bijudama, This is purely Preta vs. Bijudama (single form, Not any of the higher versions)
Path that used Preta in the Six paths of Pain:
Would be able to absorb a decent chunk of Bijudama but would it would be in futility, The likes of this path body will never be found again.
Would be Able to Absorb a very large Chunk of it. But this would also not be enough to survive. Madara's Edo Body is Going to Need a Few Minutes to Regerate.
Nagato would be able to absorb almost the entire Bijudama. The Result after the clash would be Nagato absorbing just enough to allow him to tank what was left of it. Leaving him With Serious Burns, Scrapes, Fractured bones, and just genrally beat up.