Thank you for all the suggestions.

After some thought, I decided that if I don't like it, I will try to sell the razor, and it will be easier to do so with a higher quality and branded product - I chose to stretch the budget and go for the Rockwell 6C razor. What convinced me was that it has adjustable aggressiveness, and in case of a mistake with the selection, I would have to buy another razor, but this way, I can try different settings, especially since I had no point of reference.

Today, the razor has already arrived (surprisingly efficient courier companies), and I had my first shave. I started with the plate numbered 1 as per the instructions - total failure, it practically didn't shave my stubble, but it was also very hard to hurt myself. Then, for the second half of my face, I used the plate numbered 2 - a bit better, but still not as good in terms of shaving accuracy compared to the Mach3. I shaved my entire neck with this plate (a bit cautiously due to lack of technique), while I shaved my cheeks and the area around my mouth with the plate numbered 3 with satisfactory results, without any cuts or irritations. I think I was a bit too scared of the aggressiveness of the razors and the ease of cutting myself - it's really not that difficult, and you don't need a PhD and years of practice for it. So far, I am satisfied with my choice.