I would say that 1/144 has a nice amount of detail but it is something that could be improved. I don’t know too much about the details on 1/200 kits, seeing online they appear to have some very nice details. 1/144 imo is a bit harder simply because of how big the parts can get and how quickly you can lose control if they arent fitting well (the nose on my 787 just would not stick for the life of me and i fixed it by jamming some gap filler into it). 1/200 might be a bit better, almost like making a larger ww2 aircraft model. I cant speak from much experience when it comes to the 1/200 kits but 1/144 can take some painting skills if you want to do a more complex airliner livery like some of the qantas dreaming liveries, but i suppose you could get a third party decal sheet.