Bijuus and edo tensei are quite different.
Bijuu powers, require either intense training, to be able to use, or the bijuu to be friendly with the host.
So either it requires someone to either be strong enough to fight the beast for power and win, or it requires the beast to cooperate.
Edo tensei, however just require some simple hand seals, a few fodder bodies, and voila you have a super army of undying zombies, with limitless chakra. It does not require any skill other than grave digging, and the ability to hold low level people/ ninja alive/hostage.
Also the bijuus, are sealed inside the person, and POWER UP the person who controls it.
The edo tensei user simply controls a bunch of EXTERNAL ninjas. They do not recieve any power ups themselves.
Now actual edo tensei zombies do not count as their own power(such as et hashi vs madara)
As they cannot revive themselves, and are not capable of doing things they couldnt before their death.
In conclusion, Edo tensei shouldnt be held as a true power up/ part of someones power, since it does not actually increase their power at all. It should be counted as part of somones arsenal, like a tool.
Bijuus, count as a powerup, when they are in jins, as they power up the user themselves. When not jins(controlled by sharingan etc) they are tools that are part of someones arsenal, like edotensei.
Akamaru is kibas tool for example.
So in truth it is up to the individual person, to make a top ten list, based on raw power, or overall power, or destructive power.
I personally go by just sheer power of the individual. I do not count edo tensei, in this regard, because it is not a part of just sheer raw power.
Edo tensei could work fine for other types of top ten threads.
I personally dont have any top ten list at all.
But again, if someone makes a top ten list, of just top ten ninjas(no specifications, of like raw power etc) then edo tensei users(kabuto) (oro) and (tobirama) can be included. However they are limited to techniques, and edos they have actually used and controlled, and are not able to used someone they havent used.
Example. Kabuto cant count edo hokages as part of his edo arsenal because he never summoned them.
That is my opinion at least.