None of Apple's devices currently support AptX Bluetooth, so if you want to stream from your iPhone you'll have to use AirPlay unless if you want to avoid the compression of standard Bluetooth. Which technology you end up using will have less to do with personal preference and more to do with what your device supports.
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This shouldn't be an issue for many people, but it might be something to bear in mind. If you usually use your phone's 4G connection to stream music, AirPlay will also force you to rely on your home's internet. However, because AirPlay relies on your network that also means it's liable to suffer if the Wi-Fi or internet speed in your house is less than stellar.
This means that you can remain connected to your device from anywhere in the house so long as you're connected to your Wi-Fi network, whereas Bluetooth requires you to remain within range of the speaker itself. Instead of connecting directly to your device, AirPlay connects through your home Wi-Fi network. Under the hood however, AirPlay works very differently from Bluetooth. It might sometimes feel as though AirPlay and AptX Bluetooth are more or less the same: both standards can handle at-least CD-quality music, which means that unless you're listening to hi-res music files you shouldn't see any loss in audio quality. While Apple devices don't support the newer AptX Bluetooth standard, they do support Apple's own AirPlay technology, which allows you to stream your music on compatible devices.