Notes aren't always better. It depends on the valuation cap at which they convert. A note with a low cap is just as dilutive as an equity investment at a low valuation. The YCVC note is uncapped, however, which means it's like getting part of your eventual equity round in advance.

IIUC a convertible note better for the investor in less-good outcomes because it's a note -- it's debt, not equity. In a bankruptcy equity holders are S.O.L. Creditors get to divvy up whatever is left. Which may not be much, but it's > 0 and they have a voice at the table.