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TL16C550D: THRE bit and TEMT bit

Part Number: TL16C550D

Hi all

Would you mind if we ask TL16C550D?

<Question1>
Our customer would like to judge whether Transmitter FIFO is empty or not for next transmit.
In this case, which is better THRE bit or TEMT bit?

<Question2>
In relation to <Question1>, the datasheet shows "Bit 1: When set, this bit enables the THRE interrupt. "
So, in order to transmit data as fast as possible, it seems that they had better use THRE interrupt.
Is our recognition correct?

Kind regards,

Hirotaka Matsumoto