These refer to the resolution. While 720p (High Definition) is the standard, 1080p (Full HD) is highly sought after for this specific series due to the detailed character designs and fluid animation style provided by the studio.
If you're looking for a guide or discussion on this title, here are some points of interest: Boku ni Harem Sefure ga Dekita Riyuu -WEB-DL 72...
For a more accurate and detailed review, consider providing more context or specifying what you're looking for (e.g., plot accuracy, character development, animation quality). These refer to the resolution
Also, I want to clarify:
: This part indicates that the content is a web download (WEB-DL) and "72" likely refers to the episode number or part number of the series. animation quality). Also