system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: I think putting jelly on first when making a PB&J is the superior option.

Just a thought that popped into my head while making today's lunch: the sandwich maker should always put the jelly on first. My main reason for this is that it keeps jelly out of the peanut butter jar and vice versa. Jelly is easier to scrape off the knife or spoon than peanut butter, leading to less cross contamination. This is both me being picky and me being practical. My wife is allergic to peanuts, so if she went to put jelly on toast and there was peanut butter in the jar, she could have an allergic reaction, which is a very bad outcome for something easily avoidable.

To CMV, I'd probably need to see the benefits of applying the peanut butter first outweighing applying the jelly first. In my experience, I have yet to find one.

Edit: In this scenario, like most I would assume, peanut butter goes on one slice, and jelly on the other.
gpt
As someone who took many a bagged lunch back in the ole school days, if you're talking about the "superior" way to make a PB&J there is no better construction than a light layer of peanut butter on both pieces of bread, with the jelly nestled safely in between. There are multiple reasons for this. 

1) A traditional PB&J sandwich (one on each side) must be consumed fairly quickly. The jelly will soak through the break and create a soggy mess of a sandwich. Creating a barrier of peanut butter on both sides prevents this from happening, and allows for maximum lunch box storage. 

Not all PB&J eaters are school-goers however. Which brings us to...

2) The aforementioned PB pocket keeps that jelly in there. There's nothing worse than picking up a sandwich and realizing you put a bit too much jelly on that sumbitch because it leaked out the bottom and ruined your freshly cleaned pants. Nobody wants that. It's no way to live. Putting PB on both sides insures that the edges will somewhat stick together, providing maximum jelly spillage prevention. 

And finally...

3) Have you ever tried to make a PB&J, you scoop some cold jelly out onto your bread, but in trying spread it around evenly half your battle is just making sure the bread itself doesn't rip? Look, we're eating PB&J in our homes, on a weekday - we're probably not springing for any fancy, thick cuts of hearty Italian wheat. We're talking traditional PB&J white bread here, and that stuff breaks apart faster than a Kardashian marriage. Jelly isn't smooth; it just globs there requiring some effort to spread it around. Get a good layer of peanut butter down first, lay that ground work, and the jelly goes on just fine. It's like pouring the concrete foundation, and now that jelly isn't going anywhere except into your belly, and not onto your pants, because of reasons we fully covered in point #2. 

And that is why the truly "superior" way to make a PB&J is to not only put the peanut butter on first, but also second, followed by the jelly. Good day.