I’m having a look at how knitted and Tunisian crocheted illusions compare.

This is the Tunisian version. Tension is a bit off I think - it’s very dense and stiff. A 4.5mm hook might be better. It is also determined to curl up despite all the reverse stitches; a bigger hook might help here too. Pics 1 and 2 show the sample from side and front.

Final measurement: 20cm wide by 19cm high (unblocked)

Comparison with knitted version-

Knitted is smaller and neater, but less square

Tunisian feels dense, knitted is more stretchy and flexible

Illusion works well in both samples. Photos don’t really do it justice, as other people have found.

Knitted version is better when looked at from straight on (pic 3) - circle a bit more visible in the Tunisian sample. I think this is because the ‘purl bumps’ are wider (the bumps take up the whole of a stripe, not half) and spread out over the TSS stripes a bit.

The Tunisian image is visible with a smaller movement to the side. This is just as well - as the sample is square, the larger the angle the more the foreshortening kicks in.
With the knitted sample, the foreshortening is needed as the design is elongated slightly. Compare pictures 4 and 5. Of course, this may just be an aspect of my own knitting/crochet, YMMV.

The Tunisian made more sense to me as I was making it, as the stitches are all made on the right side. Sometimes I am a bear of very little brain…
For a more complicated design, being able to use stitch markers more easily in knitting would be an important consideration.

Tunisian sample weighs 27g, knitted sample weighs 18g - this is due to difference in size
27/18 ~ (20*19)/(15*17)

Knitted version is easier to correct small mistakes, Tunisian is easier to rip out whole rows. I suspect being able to correct mistakes a few rows after making them may well be the best argument in favour of knitting!