O'Neill takes his Black Cats to Loftus Road tomorrow at the end of a week in which it was revealed Rangers' wage bill had doubled to £56million - even before their record-breaking spending in the last two transfer windows.
Harry Redknapp's ability to increase options in his squad is in stark contrast to the frugality faced by O'Neill, who could not name a full quota of substitutes for last week's comeback 2-2 draw with Fulham.
O'Neill said: "I think QPR have decided to really go for it. They spent heavily in the January window because they still felt there was a chance of staying in the Premier League.
"It is entirely their prerogative to do that and time will tell if it works.
"What they have done with those additions is they have given themselves an immeasurably better chance of staying up. They will feel they are within touching distance and it is all to play for."