The main advantage the coil plugs would have is more reliable spark.
The only lead to the coil plugs is a low voltage one, so it avoids the possibility of high-voltage shorts or breaks when the usual plug wire gets old and dry rotted.
Or shorts due to moisture, or any reason for HV to find a path to ground.
The disadvantage is the coil plugs can be a bit delicate and care must be used to remove them when changing plugs. You need to pull them straight off and not at an angle or bend.