The flanker led his country to a clean-sweep last year but it was also a campaign ravaged by injury.
Warburton feels he has contributed more in this Championship and after losing the opening encounter to Ireland he insists the achievement is even greater than the Slam.
“For me, personally, better than last year,” said Warburton. It was absolutely immense. I had a bit more of a part to play this year as opposed to last year. I didn’t feel so guilty getting up on the podium.
“It’s probably the highlight of my career, so far. It’s an absolutely amazing feeling. To do it in the way we did, to come back after losing the first game.
“We’ve worked so hard behind closed doors. Ryan Jones said to the players the week after we lost to Ireland that you don’t always have to win Championships with a Grand Slam, you can win them even after losing a game.
“That was then the focus after Ireland, to make sure we won every game. That was the target, and we managed to achieve it.”
Warburton bore the brunt of a lot of criticism as Wales endured a eight-match losing streak that culminated in the defeat to Ireland.
But the Cardiff Blues star, who relinquished the captaincy during the campaign, insists he never doubted his ability.
“It is about believing in yourself, and things will come good in the end. I have done a lot of work with Andy McCann (Wales squad sports psychologist). He;s been brilliant for me in this campaign.
“Confidence-wise, I went into the last two games feeling as good as I’ve ever felt and I put in two good performances.
“The captaincy is a massive honour, but not to have it, I was able just to focus on myself. If I concentrate on my own role, then I have done my bit for the team.
“It’s one less thing to do think about, but Ryan Jones and Gethin Jenkins have done immense jobs since they’ve stepped in. They are both very experienced players.
“If Ryan was to keep the captaincy or Gethin was to keep it, I wouldn’t complain with that.
“They are two phenomenal players with a load of experience. I am learning off those guys all the time.
“We have got a lot of great candidates who can do the captaincy. I think people can look into the captaincy a little bit too much. If a any of those guys do it they will do as good a job as anyone.”
