Some with the black hardware have reported problems with the black chipping off, mainly along the chain after it gets pulled through the grommets. Personally that wouldn’t bother me much unless it was very obvious chipping on the logo. Something for you to consider...
I do love the look of the all black - so edgy - but it may be too much black, kwim? Silver is more classic, less unique. Depends which look you prefer.
I have a toy and can attest the Loulou is a great bag! Stylish and practical and mine still looks new after three months of using daily.