Help deciding which bag to buy

Hi! About to buy my first Chanel and I cannot wait. I am going to buy through The RealReal and I’m looking at two different types of the medium flap bag.

The one on the left is lambskin from 1989 with real gold leather. It’s around $4K.

The one on the right is $7K and is from 2019 and pebble leather.

I am looking for a workhorse bag that I can take everywhere and wear through all seasons.

Would appreciate any feedback on getting a bag that’s lambskin versus pebble plus the two shapes and price ranges.