Difference between Dell u2415 monitor types?

[Aeonxal]

Hello, could someone please explain me what's the difference between these 3 monitors and which one would you recommend me for programming? (I'd use 2x) Thank you!

Link: http://www.enaa.com/search.asp?q=u2415&i=0&s=0&d=asc

 

[Tradesman1]

They look to be the same, maybe available through different outlets or from different suppliers

 

[ffg7]

they are the same. http://accessories.ap.dell.com/sna/productdetail.aspx?c=hk&cs=hkdhs1&l=en&s=dhs&sku=391-BBUW&redirect=1