Putting the SAME ad unit on your different sites, instead of placing different ad units .. Won't that be better for revenue. for it will increase the impressions of that ad unit? Right or worng ?!
Ya, it would be good but you won't be able to track that the clicks are coming from which site. And which sites gives you more and which gives less. So, better use different units for different sites. - Digital -
If he's using the same ad unit, then he can't put separate channels for each site. Which is why it would be better to use different ad units for each site.
Exactly. Same ad unit means same channel. So I don't suggest that you keep using the same ad unit, this way you can track your ads more accurately.