It is simply a matter of how you like to read it.
The reason that some people put it like this:
Type *instance;
Is because it says that only instance is a pointer. Because if you have a list of variables:
int* a, b, c;
Only a is a pointer, so it’s easier like so
int *a, b, c, *d;
Where both a and d are pointers. It actually makes no difference, it’s just about readability.
Other people like having the * next to the type, because (among other reasons) they consider it a “pointer to an integer” and think the * belongs with the type, not the variable.
Personally, I always do
Type *instance;
But it really is up to you, and your company/school code style guidelines.