19" Alloys, what offset?

yy54cnk

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Whats the general thinking on offset when going from 18 to 19" RS4 style alloys?

Looking to replace my standard 18" S Line Alloys for 19", can either have 42/45 of 35 offset.

Car is on standard S Line suspession, -20mm

Cheers in advance
 
8J x 18;
ET 47

245/40 R18 93Y
8.5J x 19;
ET 43

255/35 R19 96Y