Here's a laundry list, since you didn't specify which concerns you have:
- unprofitable to mine in farms, so fewer environmental issues
- creates a ton of fake transactions to screw with the public ledger to protect your privacy
- variable sized blocks, which keeps fees low and reduces transaction time
- pretty stable, so pump isn't really a thing
- not as popular as bitcoin or Ethereum, so traditional scams to steal your coins aren't as successful (also attracts more sophisticated users)
- less of a target for speculation, so the currency is reasonably stable
There are some downsides of course:
- due to privacy features, it's attractive to criminals, so many countries block direct transactions with fiat (need to trade some other crypto for it)
- to maximize privacy, it's strongly recommended to use your own node (boy required though), which can raise the barrier to entry
- it's even harder to find vendors that accept it vs other cryptocurrencies
Monero does seem to be the best cash replacement though, since it preserves most of the privacy-relevant features of cash.