Meditation From the Bottom-Up

A Dhamma discussion based on the question..."Dear Bhante, between asubha and 4 elements contemplation for the body, which is a better one to get insight into annata and cut the fetter of Sakkāya-diṭṭhi?I was watching a video of Ajahn (X) and it was mentioned there that asubha is primarily to reduce lust and 4 elements is for insight into annata. Would that be the case? Because in my understanding asubha breaks up the body into impersonal things as well, wouldn’t this give insights into annata as well?Im asking this because 4 elements is a more abstract meditation topic for me as of now, asubha for the body seems easier to do. What would you suggest Bhante?"