Not very good at this/don't really know what I know so take it with a grain of salt lol.
I would stick with English stuff with him, though I am sure he could do both. He has nice movement but low and sweeping rather than flashy. Don't hesitate to do dressage but I think that would aim him more towards HUS type stuff. Reining/cutting would mean a horse that can really get under himself and move/turn quickly. (I believe I have heard this is sometimes a good match) I wonder how he would do jumping? He could sit down and turn while having more of a jumping confo than a cutter would. He's still a baby give him time to grow (and change!) before you make up your mind, atm he is lanky and awkward (and cute). I think his upright headset makes him look more the part than his confo necessarily does at this point in time. If you want a very good critique I would hunt up the member Elana and ask her, she is excellent at it and will probably need to correct me lol.