We found it to greatly reduce conflicts between guests and hosts, and actually get people more engaged in our small community.
With couch surfing, I often had thoughts like "I pay for your room and you can't even put your dirty dishes away". Since we offered the room for free, we kind of expected some sort of autonomy from their side to help us out in the household or maybe cook some dinner for everyone if they stay longer than one night. They often expected that we would go explore the city with them and give them a lot of attention.
On airbnb that problem somehow mostly vanished. If things with the guest aren't great, at least you get paid. Thus you also don't need such a strict screening process anymore. Due to this, there seems to be much more diversity regarding the types of people we get to meet.
Many of them actually just want a quiet room to sleep in, and it's absolutely fine. Some people however really get involved and become good friends. Especially when they stay longer (which almost never happens on couch surfing), the fact that they pay rent just like everyone else seems to make some of them much more open to suggest improvements and be proactive.
We've met a lot of diverse, interesting people through airbnb, some of which ended up staying for a long time, some coming back regularly. On couch surfing we've mostly met the traveling couple, group of friends coming here to party and young backpacker stereotypes.
What killed couch surfing for me personally though, was that no matter how many people I've hosted, I could never find anyone who would host me when I was traveling somewhere. That really destroyed the magical vision for me.