It's not comparable though. The simplified (though slightly wrong) way to think about Grin is that its privacy is like Monero but without Monero's ring signatures. Its transaction graph privacy is quite weak.

While the author of this article makes some mistakes, here's an example of that weakness: https://medium.com/dragonfly-research/breaking-mimblewimble-...

Grin developers said in response:

> The Grin team has consistently acknowledged that Grin’s privacy is far from perfect. While transaction linkability is a limitation that we’re looking to mitigate as part of our goal of ever-improving privacy, it does not ‘break’ Mimblewimble nor is it anywhere close to being so fundamental as to render it or Grin’s privacy features useless.

Hiding addresses and amounts is certainly better than Bitcoin, but the transaction graph privacy offered by Grin is significantly weaker than Monero. It's not the same.