I think alot of that is up for debate given whats happened recently, I made a post of suggestions and what not if it helps. But user feedback is always a good idea.
List of ones I have tried:
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Midnight review:
I enjoyed using it, Rage + silent aim will get you banned at some point. They have made updates to their security and silent aim but I never got the chance to try it time ran out before that. I didnt like their UI but the cheat worked well, visuals where good and 0 crashes. Aimbot was very strong and you can customize it. They have added some new stuff towards their aimbot and silent aim as well which is worth checking out. Keep in mind that silent aim is a highly reported feature and I would use at your own risk. This one has a humanizer option which i would recommend.
Shadows/Playsharp
Bought from Telsa link I posted, Silent aim was detected when I used it, it has been updated to reflect it, it is now flagged and in red as a HIGH risk feature. Everything els workled just fine 0 crashes and good visuals. I had limited time to test it as I got nailed with in 2 matches with silent. (Remember to use with cation and take this review with a grain of salt, as I mentioned previously of risky features.) UI was good and visuals where good, no lag or fps drops.
Eternal
This one I still have access too and still play with from time to time. It does not have silent aim and works very well without it. There was a detection issue at the beginning which got alot of my accounts banned withing in mins of using or after 1 match. But that has been resolved which you can see in posts or in their discord. Since the update I have still used it and 2 of my accounts are still working fine. But bans still do happen even with this. But alot of that can be rage, tracking threw walls, high kill count or even high unhuman like accuracy. The UI on this is really good, it does play well. This one does have some crash issues but if it does happen there is steps for it and please report it as the dev does ask for logs. Crashing has come down a bit since updates.
Final thoughts:
I enjoyed my time with all 3, but I also played 2 out of 3 of them before adjustments and updates where applied, the last one on my list is the only one I still have time for and managed to play after updates. As far as safest chair is concerned probably one without silent aim or just don't use silent aim. It's a risky feature in marvels currently. I think DMA cheats are a little safer in my opinion based on what you are asking. But those are my findings based on what I have used so far. I hope it helps, please remember to do your own research and hopefully others can reach out to you with their own thoughts,.