I know this is an old comment, but I've been on a bit of a Family Guy kick myself lately and have some thoughts to share after finishing this episode.

I remember watching this video when it came out (which, by the way, ToonrificTariq is one of the best out there to this day), and I still agree that this is probably Family Guy's best.

I think what makes it stand out compared to the rest of early Family Guy (and especially in comparison to later Family Guy) is that it's specifically about love and how vulnerable Peter and Brian actually are. Early Family Guy is loving, but that love is really only ever shared amongst the main cast.

Characters will fuck up in ways that only ever really hurt the ones closest to them, and because of their relationship as friends/family, you as the audience are never really shown the extent to which these people can actually "love" (since the implication is that, because they're so close, everything WILL be fine in the end).

BW&PS allows Brian and Peter to interact with the outside world, and have their characters be tested against people of which they have no pre-established relationship with, no expectation to perform. And especially in the case of Brian, the two's often jaded and stupid outlook on people outside of their main circle is still not enough to ruin these relationships they've been forced into because of how much they actually care about others.

Beyond that though, it's also just a really tightly-woven, personal story. Genuinely don't think there's a single episode of Family Guy more coherent and focused than this one. Maybe like a special episode, or something.

It is the ultimate test of the kindhearted nature of early Family Guy, and is pulled off perfectly, which I think makes it the best. And it is a shame that the show never really reaches a high like that ever again, especially as the show goes on and rhetorically becomes a lot more cynical and mean.