I'm comparing the specs of three different 20-amp GFCI replacement electrical outlets for our bathrooms.

The NEMA configuration for

(A)(P&S/Legrand $27/3) is 5-15R,

(B)(Cooper $21/3) is 5-20

(C)(P&S/Legrand $42/3)is 5-20R

Does it matter which of those 3 I install? They're all 20-AMP so I don't understand the "5-15" type numbers.

The Grades are: (A) Residential (B & C) Commercial

The rest of the differences aren't important, although two of them are made from Nylon instead of Plastic and I think Nylon would be more durable, am I correct?

Item (A) is $20 cheaper than (C) and that really matters right now, unless a 5-15R isn't as safe as a 5-20R. Thanks for your help! Susan