I cannot speak for the other two but I bought, and very much regretted, the Korda version.
I got two of them at the same time thinking to keep one and use the other.
First time out used and broke the first one.
Back at home I tried the other one, and lo and behold, I used it on two lengths before that too broke. The blade bent too far back and whe ntrying to straighten out, it broke!
I now use my nails and teeth to separate.