If you are exporting for playback then there is no advantage in exporting as 24 bit, the noise floor for 16 bit is -96dB ref to 0dB, which is well below the limit of what any playback audio device can achieve, and for 44.1 or 48 kHz sample rate frequency range is beyond that of the human ear.
If you need best quality for further editing/mastering in other software or a distributor or customer requires 24 bit audio then you need other software which can create/export at 24 bit eg Samplitude