I have smoked weed a lot before and during come up.
I have also only smoked it once high.
Really depends on tolerance tbh. If you smoke a lot, like daily for example, before during after, its fun but all the same.
If you smoke once a week or month or less, the when you smoke in relation to the mdma high will be relevant. In this case i do agree with comments above, after being high, at peak perhaps slightly after is best.