Jsbin needs a pro account for many features (such as embedding), so I’d refrain from it, since the others are just as good or better.
It’s got a beautiful design, but some things are stupid about it. For example embedding the code into an other page. Apparently it can be found in the export menu:
But what I get from this menu is this:
So I guess it’s a pro feature? Anyways, they could at least show those items, but gray them out and let me know why they’re not available.
Also some bugs, for example if I accidentally put some css in the html panel, I can’t remove it anymore because the error notifications block my view:
Apart from this, the view seemed to load a bit faster than with plunker and is better structured with the js / html / css / result tabs in case you have something simple to demonstrate
(okay, the scrollbar wouldn’t need to be there, but that’s a detail)
Since plunker supports many files, it needs to be laid out a bit differently than jsfiddle. Here’s what it looks like:
It’s also quite neat, and I had the best experiences with editing in plunker so far. Also, with the plunker preview I found that it shows the result first, while the jsfiddle shows the js/html first. Here I’d say it depends on your use case what you prefer.
I’d recommend JSFiddle for simple things or plunker for entire apps. However, if you have many, many frames to embed, none of the options might be ideal. As you can see here https://www.bersling.com/2017/03/22/flexbox-tutorial/ it might slow down quite a bit if there are too many frames.