Both are safe and you won't have problem with them. If you're worried about getting hacked, it's because of your negligence. Don't input your seeds to any forms online whether you use ledger nano s or trezor.
About PC having no anti virus, there's a chance you'll be hacked by those copy paste address attack. Otherwise, you're free and safe because these two are the most reputable. Btw, I own a Ledger Nano S and its still working.
First,I didn't quote all who commented in this thread because it would take too much space,but I want to thank everyone who helped with their comments.
@jossiel I plan to keep seeds words written on paper and stored on safest place possible.
I have anitvirus,but I also use,well...pirated websites very often and I often have viruses,but I remove them frequently.
I know there is a morality issues with that,but I mostly use them to try product before I decide if I'll going to buy it or not.
That's what you should really be doing for keeping your seeds. You don't put that on any online storage, keeping it on a written form and safe place for the storage shows that you know what you're doing.
Avoid using or downloading things on pirated websites, you might encounter a malware from any of the app that you're downloading there including downloading cracked anti-virus.
Just avail an anti virus that came from the official company, it's not that going to cost you much for your security.
You said there is a chance I'll be hacked by copy paste address attack,what did you mean by that?
A sudden change of your bitcoin address upon copying your own. The one that you'll paste will be pasting the hackers bitcoin address which would likely come from a malware, that's why avoid downloading on pirated websites and as well as unknown apps.