When do you use "more funny" and when do you use "funnier"? Let's have a look at two samples sentences, which will explain a bit further what I mean.
A. Mr Smith is more funny than Mrs Jones
B. Mr Smith is funnier than Mrs Jones.
In this case, I would say that both of them are correct, but I am not sure.
C. Mr Smith is more funny than serious.
D. Mr Smith is funnier than serious.
I think, only example C would be correct, because D sounds illogical. What do you think?