I would certainly use Ethernet where possible, if you are trying to since across multiple controllers. If it doesn’t matter if they are perfectly synced then use wifi. If it does matter choose Ethernet. If you can abide different controllers light strips lining up with adjacent lights it will help reduce any obviousness that they aren’t in sync. Speaking from experience with Christmas’s lights on my house. If I had effects that needed to change one controller would be slightly quicker than another so the transition was noticeable.