Is MBAM better, or is microsoft defender enough if you download from trusted sources?
Do you consider Nyaa safe? (I’d like to get a visual novel or two that I haven’t purchased on steam yet)
Regarding other games, I always used pirate bay and I’ve been fine, 10 years ago though. Are the website listed in the wiki generally safe?
To be honest, common sense is the best form of security. If you don’t trust something, either run it in a VM, or don’t run it at all.
To answer your question, Microsoft defender should be plenty.