In regards to the above post, I don't like the texture of Ricotta so that's why I use both. It's not as bad. I think Ricotta tastes like a "mud paste"! Eww!
Cottage Cheese instead of Ricotta
Try using half of each. I do that and it doesn't really seem to change anything. Sometimes I feel Lasagna can get a little dry depending on the brand and type of cheeses you use.