Adarq.org

While it is difficult to compare the relative hip, knee and ankle moments of the three stance widths because of differences between subjects, there is no indication in this study that wider stance width squats involve lower knee extension moments than narrow stance width squats. In fact, the wider stance squats seemed to produce greater knee extension moments, suggesting they may be better for strengthening the quadriceps than narrow stance squats.

For strength and power athletes:

There was a trend for greater time spent in the acceleration phase in wider stance squats, which is an indicator that wider stance squats could provide a greater training effect. Strength and power athletes may therefore obtain greater benefits from wider stance squats.

There was a trend for both knee and hip moments to increase with increasing stance width. This is another reason for strength and power athletes looking to develop leg strength and power to prefer wider stance squats.

and i could also push better with my heels