To play a game like FeralHeart you'd be able to do so on either no matter what sort of computer you might get, however.
This question of laptop or desktop is all down to a matter of personal preferences. If you want to be able to carry your computer around a lot, move it, sit in different places and work/play on it, then you'd want a laptop. If you want to sit more comfortable at a desk and have a computer running for longer times, no need to charge constantly or worry about general "wear and tear", you'd want a desktop computer. Of course you could get both as well, but not everyone love computers that much nor want to spend so much money on something that pretty much does the same thing.
I can list some quick and somewhat obvious pros and cons list for you and one can determine a bit more themselves what is worth and what is not. I know this could be explained in a more detailed manner, but this is generally speaking.
Pros Laptop:
-Easy to move around and use in different places
-Unbox it and use it, you don't need to get a lot of extra things.
-It barely takes up any space.
Cons Laptop:
-Laptops tend to run more hot due to the limited space it's all packed into, especially if playing games.
-You need to charge your battery, and the overall lifetime of a battery can vary a lot.
-Not everyone carry around things like a mouse, keyboard and a bigger external monitor so the "experience" might not be as good.
-If something breaks hardware wise on your laptop, it's not as easy to fix it, and in some cases hard to replace at all.
-Due to the smaller form factor, you pay more for less in many cases.
Pros Desktop:
-More value for your money when it comes to raw computing power.
-Easier to maintain and fix if something breaks or needs to be replaced.
-No need to worry about charging it or your battery going dead.
Cons Desktop:
-You need to spend some money on things like a monitor, mouse and keyboard unless you already possess this.
-You will be stuck at a desk most of the time or at least in your very home, this is not something you carry around obviously.
-It's bigger, what can I say.
There's more, and things could get even more detailed but this is just general speaking.