2020 hybrid ecvt question.

Is it better to drain and fill rather than do a flush? I took my hybrid to a local mechanic after Toyota service suggested I flush my transmission before it hit 100k, it was 67k when I flushed it (unknowing if it’s been flushed before)
They suggested either flush every 30-60k miles or drain and fill after every 10k, which is the best option in regards of the health of my transmission.