easier on a stick I presume.
Just saw this now. Here's what I have to say about the concept of "easier" in this situation.
To me, it's just inconvenient to attempt on a gamepad. It's possible but it requires so much deliberation that there's no way to casually perform it. On a stick, some people might feel it is just as difficult, and granted it can seem a bit daunting to have all the buttons on a single face like that if you aren't use to it. However, if you take the time to learn the best way to press each button and take advantage of all your potential finger coordination you can do the charge LK into the combo on the fly.
On a gamepad it's just silly because you have to get to block in the middle so if you wanted to, try charging kick with your thumb, put your middle finger over block, and the hit the rest of the combo with your index finger. This simulates to some extent the coordination behind doing the combo on a 6 button face So basically on a gamepad, in order to charge LK and completely take advantage of the rest of Jax's potential, you have to hold the gamepad in a way that inhibits your motor skills.
In casual performance on a stick while charging LK already, you would charge LK with basically 1/4 of your right palm, like, the knuckle that attaches your finger to the rest of your hand, then hit HK, HK with your pinky but mostly the middle of your pinky unless you have tiny hands, D+HP, HP using your index finger, BL with the middle knuckle of your index finger, LP with your thumb, and B+HP again with your index finger.
Performing it on a stick sounds much more complicated but it's actually overall a much easier execution of dexterity memorization on the fly.