Now THIS is a proper contest! Two absolute giants!!
Sutherland and Deutekom are both perfect for this repertoire.
This is Sutherland at her absolute prime, it's a gorgeous gorgeous voice, with laser sharp coloratura - love those trills, they really add to the piece. Even though the speed is crazy impressive, especially with how exact her coloratura stays and how her gorgeous voice never loses quality through all those acrobatics, I find the tempo a tad distracting and not at all enjoyable. I still find that she disappears on the bottom half quite a bit more than Deutekom, this is most likely due to the recording but seems like a common trend in her singing. She looks STUNNING on the cover picture, I bet visually she was absolutely fantastic to look at in this role!
Deutekom is my favorite Queen of all time, she is absolutely sublime in this role, her voice has that fantastic cool, silvery edge - it's also extremely well developed, such a high set voice but so resonant on the bottom as well. I find her odd coloratura really fits in the opera. She's emoting fantastically here, there's a certain vulnerability but with a lot of steel woven into it - an undertone of wickedness. I also cannot say her voice was much smaller than Sutherland in any way, maybe her tops weren't as gigantic but overall Deutekom has a much more even voice throughout, with more chest participation overall - in fact, Deutekom, when she debuted this piece at the MET sounds absolutely like a true old age singer, with the lovely tight vibrato and extreme penetrative quality, a gleaming ring accompanying the sound always. The most impressive part was that she maintained her voice extremely well and practically kept it identical to her prime up until she developed heart failure at age 70. The only downfall she has is that she's not the best triller compared to Joan Sutherland overall, but she's landed successful ones many times.
Also, her contemporary reviewers and even other legendary singers never really criticized her cluckatura, she was always noted and praised for her extreme precision and exciting approach. A New York Times reviewer once wrote "Cristina Deutekom sings the two fiendishly difficult arias for the Queen of the Night with an effective brio and as much accuracy as can be expected." (1971)
Wikipedia:
"For fast coloratura passages, Deutekom developed a glottal-stop technique, sometimes called glottal staccato. In her own country, a few criticized it as hinting of yodeling, while others dubbed her coloratura technique "cluckatura."
Elsewhere her technique was extra appreciated. In Italy she was named singer of the year in 1973 and 1974, precisely because of her deliveries of bel canto."
Take that!! Deutekom fan forever!!

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Voting for my all time favorite, Cristina Deutekom! The best Queen of the Night! A truly once in a century singer, completely underrated nowadays sadly..