The only good thing about Penny is her facial expressions. Don't get me wrong she is a nice person, but I think she is boring for Big Brother. Lina is much more interesting.
On a show like BB you need conflict, not people who get along.
Lina is a great housemate. She has particular views that put her at odds with the mainline in the house (or what was the mainline), namely the boys club. She doesn't like their discussions which she finds vulgar and says so. It doesn't matter who is right or wrong, all that matters is that there is conflict. How they deal with that conflict is what makes Big Brother interesting to watch. Penny is too easy going. We don't need people who go with the flow, we need people who go against the flow. IMHO.