Hello ker0pi,
I have used both a treadmill and an Elliptical. My personal preference is the Elliptical.
I used a treadmill for quite a few years and then I got hurt on it.
I was already on it and doing well. I decided to increase my speed which I had done many times before.
Unfortunately, this time I had a MS moment better know as a cognitive glitch. Instead of pushing the up arrow which is a slight increase I pushed the number 6. It was faster than I am capable of doing, I was literally at a run and I don't run

.
I was hanging on for dear life trying not to land face first on the belt. I finally let go with one hand to hit the emergency key which had too long of a string. Since I was only using my right hand to try and remain on the treadmill at such a fast speed (for me) I ended up with a partial tear of the right rotator cuff.
Once healed I tried the treadmill again

I found my leg would lock up which made using the treadmill unsafe.
With the Elliptical I have control if it will move or stop. Much safer and I enjoy it.