It can be tricky when comparing IMO, just the other day I was trying to compare 400mw of green to >1W of 445nm, and while the green beam was brighter, the blue just seemed more pronounced, or atleast more of an 'eye catcher'. A few of my friends had different opinions as well, the consensus seemed to be that the green beam was brighter, but the blue beam was more visible, if that makes any sense(didnt to me??)
Possibly the fact that the multi-mode 445nm produces a fatter beam next to the dpss green.
IDK, but the comparability seems to vary from person to person...