You didn't mention what's your traffic source, so it depends.
If you use PPC, I would ONLY go with a landing page, collection optins and presell your gig. Regardless what the niche is.
If you are onto Article Marketing, Video Marketing or so you can do both.
I personally test niches by directlinking first, buying a cheap .info domain and when it cracks, go and make a lander at a .com domain.
Test what you think is better and stick to the formula I mentioned.
Again
PPC is a big NO for directlinking as you can't capture leads.
G.