I have been using the Cimco Stripax for many years, I consider it to be one of the best, this version in the picture is the best (compared to other Cimco's because I have used them), there is a quick adjustment of the insulation thickness. It is often useful because the insulations have different hardness or thickness and such adjustment is very convenient and quick. Total automatons aren't doing that well anymore. I used it for stripping telecommunication wires 0.5mm it worked as it should, but mostly for electric wires and it works perfectly there. Unfortunately, the price is high, but for a professional it's worth the expense. One note, I don't like very low temperatures (below -10 ° C) (the handle may break) I had a few cases in the company. But you can always try the Cimco guarantee, if I'm not mistaken it's 10 years !.
Privately, I have and use those from photos 1 and 3 from the beginning of the post.
1 pic: the cheapest, universal, even for a professional. If you train your arm, you don't even need to use a setting screw. For occasional use, it is the economic and utility optimum. However, you should pay attention to the build quality of the blades when buying. It is very important that they fit perfectly with each other (they should touch each other - and practically gently rub against each other), otherwise the insulation will not be cut well and it will be difficult to use. For convenience, grab the tool before purchasing. Good hands mean no prints on the hands. I see! Check that the handles are well glued, it is important to remove the insulation from the cable and not the handle from the tool

because I had such cases too.
3 photo from the beginning of the post: I have a basic version (no company or toya), the progenitor of this from the photo but based on the same principle. Personally, I do not recommend it. It works, but the jaws often damage the insulation (the rest). 0.8 0.5 is not suitable for thin cables. The mechanical system allows the cut insulation to fall into the mechanism and stops working properly. It's not a problem to shake her off quickly, but it pisses you off. Not resistant to dust - you need to keep an eye on cleanliness. Besides, a large and heavy tool. It will not go everywhere, and the arrangement of the blades (the way we insert the cord) is not optimal from an ergonomic point of view. Not suitable for a professional. I used it on the construction site for 2 months, the springs were bent also now it is suitable for a bucket. I bought it when I started my adventure with electrics and I had no idea about it. Now I only keep it out of sentiment, because it is "my first tool"

Maybe the newer versions do not have these drawbacks, but the principle of operation has not changed, so I will not trust this solution for the second time.
2 pic from the beginning of the post - I used different versions several times based on the same principle, each time I was throwing out faster than I picked up

Too much fiddling with buttonholes. Zero ergonomics of use - usually when the insulation let go, I knocked my hands against the nearby protruding things (e.g. cans, casings, walls and so on). Personally, I find this solution a miscarriage.