Bluetooth can process less, so if node density is too high, it just skips some. If a script has nodes too close together, on wifi it can still often do those movements, but it wont be smooth anymore as the device will sometimes stutter to sync up again. For nodes further apart it doesnt have that (it can then compensate better).
This is why bluetooth in some cases can feel more smooth. But if this happens nearly everywhere, you have an issue within wifi itself that isnt normal. Wifi is normaly the superior connection.
Unless you use a passthrough method that introduces a delay (for example, pc sends to phone, phone sends to device), as in those cases the delay will introduce more issues. But thats why you have to use the connection key in scriptplayer/handycontrol. Its to be as direct as possible.
Also, if you are constantly downloading/uploading, you might also reach limits on the router. A lot of wifi connections are slower than what the provider can provide (depends on country and hardware though). But if the network is reaching its limit, its no longer reliable at timing.
