ProofCore is the best in terms of security, I trust it on my main account. Its probably my favourite provider right now and I'll continue to use them for the remainder of the year.
However, I will be honest. The cheat does have major issues. This is not me trashing the cheat, as its a brilliant cheat when it works.
The issues with ProofCore is that its riddled with bugs that haven't been addressed for months. I asked a friend who has been at ProofCore for a year longer than me and apparently these bugs were present back in MW3.. It's Black Ops 6 now and there are still issues with the aimbot having major glitches. It will snap sometimes randomly at a target similar to a rage hack or snap at the floor/sky, its also a very very basic cheat in terms of its features. It has no prediction, no 'real' 2D radar that you would expect a cheat to have, visual customization is lacking, no ignore downed players, no thick skeletons even though there has been a placeholder in the menu for nearly 3 months, no full body deadzones like PhantomOverlay, etc.. Lack of features doesn't necessarily mean anything bad though, even though this cheat has major issues with it, I have to be completely honest and admit its still my favorite hack I've tried so far in the external scene.
Also, another great thing about ProofCore is, if you are willing to rage in a Hack vs Hack, it's the BEST external rage hack you can get on the market. My friend and I 2v4 ragers in ranked and hardly ever lose. Obviously you'll have no chance against something like Inferno but we rarely ever lose to PhantomOverlay or other external ragers.
ProofCore can be the buggiest cheat on the market and honestly its still probably the only cheat I'd trust on my main. So that's saying something :)
If you want to keep your account, go with ProofCore. I've not had a single shadow ban with them either, their aimbot (when its working without issues) is honestly the most humanized cheat I've ever used.
Forgot to mention: if you play Resurgence this cheat will cause major issues if you're vsing movement demons. The cheat does not adjust if you're holding the aimkey and someone slides. It will still aim at the head level even though they're sliding. It won't follow their head, so you'll be shooting air. If you down someone the cheat doesn't follow the downed player, it keeps shooting at the position they were standing at, you need to release the aim key and then fire again for the aimbot to start shooting at the downed player. So many major issues that could be fixed easily and have been mentioned for so long, it's quite sad that they don't show any love to COD :(
but maybe one day :)