Suffolk judge Craig Mitchell, Gemini Prime Lamb, Werneth, said he had the greatest difficulty choosing between the young ram and ewe, when it came down to supreme champion.
But the Australian Sheep & Wool Show judge eventually chose the ewe, exhibited by Rachel Chirgwin, Curlew Valley, Manoora, SA.
"That ewe is exceptionally well-balanced, she is tremendously good on her legs and feet, with a great carcase," Mr Mitchell said.
"She has that beautiful wedge shape.
"She is both very wide and deep in the back end, with a beautiful smooth shoulder and enough femininity to carry her."
But he said the quality of all the sheep on show had been exceptional.
"The Suffolk breeders should be proud of themselves, to put up a line of such shape, depth and quality," he said.
Mr Mitchell had to judge between 108 entrants, exhibited by 14 studs, in three states.
"It was extremely hard to choose," he said.
"These are as good a Suffolk sheep as I have seen anywhere."
The final two sheep exhibited everything he had looked for all day - structural correctness, carcase, depth, width, refined through the front end and breed type.
"I think they are two tremendous sheep," he said.
Ms Chirgwin said she had brought six sheep to the show.
The ewe was sired by artificial insemination from a Blackbutt, Bencubbin, WA, ram.
"She is out of my first AI program ever," Ms Chirgwin said.
The May 2018-drop ewe recorded figures of a 0.58 kilogram birthweight, a weaning weight of 9kg, a post weaning weight of 13.5kg and a post weaning fat measurement of -0.3 millimetres.
The ewe had a post weaning eye muscle depth of 0.7mm and recorded a lamb 2020 figure of 128.7.
"I picked her from the day she was born, and I've been watching her cautiously since," Ms Chirgwin said.
"She has tremendous muscling and she is very feminine, with a terrific birthweight.
"I chase growth, because that's what my clients are looking for, and she hit the mark on eye muscle depth."
Mr Mitchell said any one of the rams was truly worthy of winning a broad ribbon.
"It's a credit to the breeders, to breed such a great line of rams," he said.
The champion Suffolk ram was taken out by Sayla Park, Kilmore.
The under 1.5-year-old ram recorded figures of a birthweight of 0.33kg, a weaning weight of 6.9kg, a post weaning weight of 10.5kg, a post weaning fat of -0.2mm, and a post weaning eye muscle depth of 1.8mm.
He was sired by a Sayla Park ram, out of a Kerangie dam.
"I think the champion ram has that little bit of fat, he has got enough muscle and growth, for his age," Mr Mitchell said.
"He is tremendous through the loin, tremendous through the hindquarters and stands up really well on his feet and legs.
"You won't see him put one foot wrong, and he has a really good head on him."