Suggestions about crypto ads on Meta

Hey, I don't think someone will answer my question, but still would be great if anyone here answer it.

1. Which campaign is better? Conversions through website, Traffic, or on-facebook leads?
2. What weekly budget is suggested to test the water and get result (1 conversion) - With average performing landing and let's say target country is UK.

Anyone?

I know one service, they are specialised in meta ads, regarding crypto and any gray and black hat verticals.