I agree with BlueRaspberry that 9s are likely the most empathetic, as opposed to 2 or 4 or 3.
But if you just look at 2 and 3 and 4, I would say on the whole, 2s are likely to be more empathetic than 3 or 4. Of course this varies by individual, but in general I experience 2s as more empathetic.
For me as a type 4, I dont' consider that demonstrating empathy is as important, as loving people. And I arrive at love in what I consider a natural way, not a forced way. So if I dont' feel love, then I dont' feel it and I feel no obligation to come across as loving or empathetic. But the 2 does feel some pressure to be loving/empathetic and if this is genuine, it's delightful, but when it's not fully authentic, it is disappointing or even gross.