Legather: I noticed the 'campaign' has both the main SF3 story and a scenario set before the main campaign. My first impulse would be to try the chronologically first story but since it was below the main campaign in the options I'm wondering if it was meant to be played after. I don't want to spoil anything for myself so I was wondering if anyone can help me out with the intended order?

Cheers for your attention and help!

Unreal_NeoX: If you own the scenario mission, i recommend to play it first, since it is a prequell mission to the main campaign.