I've noticed that the javascript embed option does not add a title attribute on the iframe. The title attribute is required for iframe for accessibility. See https://www.w3.org/TR/WCAG20-TECHS/H64
I know this is nitpicky - but I work for a university and we're required by law to make our websites accessible. Plus its the right thing to do.
If you get the iframe from the code option, the title tag is there - it just doesn't appear when using the javascript embed option.
Thanks!