Any used or new laptop is good if you are using it in a way that it is immune to viruses. There's a lot of antivirus that can prevent your laptop pc from getting hacked. But you need to look at the specification of any laptop before you buy it. Processor and it's generation, ram, cooling capability. You can all that info from YouTube on internet. One channel that I can suggest in Linus Tech Tips(LTT). But you need to do your own research on what you are looking for in that laptop.

And using a laptop as a wallet is never a good choice. Better to have a hardware software than using laptop for that purpose. Software wallets are never immune to hacks and hackers. And I have seen this many times because it has happened to me already. Once you get hacked one time, doesn't matter what you do, use new OS, change internet connection, all this can't prevent you from getting hacked again. Those hackers will always find a way.

For exchange and trading purpose, you can use it and buy the one that suites you. But for hodling crypto? Use hardware wallets. Trust me, you'll be in safe hands.