Default Digitizer lens broken !!!!pls help

Yesterday i droped my phone and the upper most glass aka screen/glass broke. Now i want to replace . I CAME accross 2 methods
1. Replacing full digitizer ...costs 1400
2. Replacing only the glass .........costs 400

Can anyone suggest which one to prefer moreover if anyone knows how to go ahead with 2 option please share it with me..
Worried about mah phone..

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