Monoprice vs SGP Crystal Vs Power Support Crystal based on real comparison

for have used @ least 2 of following: monoprice clear screen protector, sgp crystal, or power support crystal screen protector, how compare in feel, clarity of display, , amount of protection offers???

i'm looking screen protector provides clarity, protection, , feels slick. i've heard monoprice film "just good" makes me wonder how that's possible.

if there difference, please describe better , in way.

 

sgp , ps comparable in experience. never used monoprice.

 

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