Who had the better resume when undefeated? Brian Nielsen or Deontay Wilder

Yes agree
I am missing much of the context, but so are you in your response

Yes Holmes was much more experienced

I was talking about when both fought their respective opponents and Ortiz was having only his first world title fight at a much older age than when Holmes first contested, so agree Holmes was far more experienced and also that he likely had more miles on the clock

Yes I would agree that is most likely but also say Holmes was also by far the greater fighter of the two, more experienced,

I do agree, and have made that argument before myself.
With that in mind I think it's also fair to say Holmes was still boxing well at that age

I can't speak for everyone and don't try to.
I'm not disputing how you may have scored a fight, but that would also show how good Holmes still was. As you say you can't compare ages even though that is exactly what you have done here and above to suit the context you are looking at

I have read many things like that with so many boxers where there are conspiracies.
Maybe some things are true. I don't know, but seeing as I don't really recall Nielsen being pushed into the mainstream too much am not sure what would have been to gain if all the above
Who knows? Certainly not me. I just go by what can be proven where possible

 

Please read where the comparisons were up to ie before draws and losses
Wilder had only beaten Ortiz once.

Now you are trying to use certain arguments to suit
Atm any fighter in the current top 10 is relevant in that sense, but I would arguably possibly still favour a retired Wladimir Klitschko to possibly beat some of them.
Now Wladimir has been retired for 8 years, lost his last 2 fights and would not be considered relevant in the sense you are saying, but I would still rate it as a fair win if an undefeated contender beat him and likely higher than perhaps Ortiz due to previous achievements even though Wladimir would have first fought nearly 30 years previously.
Some fighters that enter in the top 10 don't always do as much as some that don't in some occasions

 

I have openly said I suited myself to a degree on this thread. Most do. That's what often makes a good debate
I just pointed out that I think you have done similar and gave you an example above that the context I feel you gave wasn't as thorough as I think you felt

There isn't any mental gymnastics
Tell me Ortizs top wins at that time?