For me when I have had to change my screen in my Galaxy, there wasn't much to decide from, the really important this is to make sure to get what you need, glass digitizer or the LCD. That is the big thing that I look at before I check for what to get, after that I look to see what things will be required to fix that part along with whats more convent.
If there is just a surface crack the screen it is just the glass digitizer
--Knowing samsung, the glass is glued to the LCD and it can be separated and swapped out.
---you would need to get LOCA glue (if it doesn't come with the glass) and a UV light to dry the glue
If you see black lines or if there is a crack under the glass (or both) then you'll need a LCD.
---from experience it is easier to just get a full LCD with the frame attached and swap the inner parts.
----for this just make sure that the LCD and frame are the same or comparable model (i.e. a Sprint body wouldnt fit and AT&T body because of the sim card)
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