There are several factors to consider.
AirPlay will depend on the speed of the wireless router, if it is an old or slow router, then streaming audio via AirPlay will cause stuttering, lag, or simply not work.
Personally, I have found Bluetooth to be an easier wireless audio solution. It doesn't lag and is universal between most modern mobile devices. The problem with wireless streaming is that the sound quality won't be as good as AV wired.
I guess it all boils down to a balance between convenience and quality.