1675 Pepsi build question

Hello everyone! I am still new after building my first explorer from raffle. Ordering from raffle was so easy and straightforward. Now I want to jump on to the next step, 1675 pepsi! Then I noticed there are so many "options" that I can do. Viet, milk (still don't know what it is. I assume the supply name), raffle, some random names.

1. Viet vs raffle: I assume the viet parts are more close to the gen. What are the exact differences? Is it something worth more costs?

2. What would be the best value? Cost high but getting all from viet? Get rep (WMF or BMF) then mod a little? Simply get everything from raffle? I honestly don't mind the cost but I don't want to spend thousands more to get the slightly thicker font or case lugs.

3. It seems viet is not a single supply. More like all suppliers from Vietnam, am I right? If yes, where should I get the parts from?

Thank you!