Which model out of these 3?

These 3 offers are for me:

MacBook Pro 13, 2019 256GB 2.4GHz i5 Retina Touchbar etc 1530 euro
MacBook Pro 13, 2018 512GB 2.3GHz i5 Retina Touchbar 1.450 euro
MacBook Pro 13, 2018 256GB 2.3GHz i5 Retina Touchbar 1300 euro

Now, the question arises which laptop is worth the investment (the cheapest option is of course my favorite, but would not hurt more memory synonymous.)

I would say the last one.