At 440 ppi pentile would not matter at all.
Samsung has access to every mobile display technology, but Samsung uses AMOLED on its flagship phone. Why? Because Samsung considers it the best display technology.
Apple uses LCD because Apple doesn't have access to the best display technology. So Apple has to use the old tech backlit LCD which became a commodity.
Apple has access to whatever display technology it wants. $137 billion of cash can buy a lot.