I need some opinions on which font to use to replace this black text on the official org website. I'm heavily leaning torwards the first one because the font looks very modern
Playing with type is one of my hobbies! just as a note of course you can go with any of those but always have in mind that you can (and should!) be able to change the space between the letters and the weight and see how it behaves
for example in your selection you can see that the U R and A are basically the ones that have the most character and tend to change from typeface to typeface
Here are some I played around on my end, most of which are variable fonts so you can tweak the specific weight so it can work both on dark and light background