In term of aggressiveness, there is no comparison either.
My current 6-line wrasse I inherit him from a friend that move out of the country and does not want his fish go back to a LFS or care for by a novice reefer. I have them in my QT system now. I vowed not to keep 6-line wrasse again about 20 years ago.
20 years ago, I was keeping a 420 gal system, full of life and coral. In this rather large tank, I had a pair of Mandarin Dragonette and a pair of 6-line wrasse. They were doing great as was all my animals, fat, healthy and happy. All 4 were spawning regularly. They totally ignored each other for 18 months.
One day, right in front of me, the 6-line pair attached my female Mandarin. They coordinated their attack, and it was over in a second. The 6-line attacked within a fraction of a second, one peck out the Mandarin eye, and the other the other eye even before the Mandarin have any time to reacted. The Mandarin female was blinded before she had time to swim even an inch.
After the attack, they totally ignored her, and ignored the male Mandarin, and go on their merry life. This was very unnerving for me. I spend the time and work needed to remove the pair from the tank and back to the LFS for free. I euthanized the Female Mandarin after a few weeks when it was clear to me that she will not recover her eyesight and she became emaciated.
Heel our warning, get a 6-line wrasse at the peril of your other fishes.