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A link from a site that has nothing to do with yours is worth very little and looks like what it is. Everyone here writes about travel, so the placements make sense to a reader before they make sense to a crawler.
Both run through the same verified membership and the same monitoring. The difference is only in the shape of the exchange.
Option one
You link to them, they link to you
Option two
The loop closes back to you, never straight back to B
This is the part most exchanges skip. Agreeing to a swap is easy. Making sure it is still standing in six months is the actual work.
Apply with your site and I'll come back to you by hand, usually within a few days.