Chrome, and browsers based on it, currently account for more than three quarters of web traffic. This gives Google a huge amount of power over the web and how people are able to interact with it. Google is also a company who’s primary business is advertising and surveillance; this means they have every incentive to curtail your ability to stop websites from spying on you and force you to use the web on their terms. They’re currently exercising this power with the rollout of Manifest V3, where they’re severely limiting the functionality of content blocking extensions like uBlock Origin.
It’s main advantage, as far as I can tell, is having a much simpler interface. It’s snapping tools are trivial to use and discover, but far less robust than Krita’s assistant tool. It’s easier to add brushes, but you have far less options in configuring them. I don’t thinks there’s anything that Firealpaca can do that’s partially hard to do in Krita. Also, Firealpaca doesn’t have a dark mode.
I’m not an experienced artist though, so take my opinion with a grain of salt.
Its brush engine is kinda bad though. You basically have to turn on “Zero pressure at both ends” and put the stabiliser up to like 15 to get anything usable. Not sure I can recommend it.