OE vs OEM

[anxious]

I have been considering getting OEM parts instead of OE.According to turnermotorsport, its the same. See http://www.turnermotorsport.com/c-216-bmw-brake-pads-stock-oem.aspx

 

[anxious]

Also see http://www.imautoparts.com/aboutUs/oes-vs-oem.aspx

 

[anxious]

Is the "feel" b/w OE vs OEM parts different? OEM costs 1/2 to 1/3 cheaper of OE.