I feel weird for saying it, but I've never found the Simpsons funny whatsoever. I just don't find the content entertaining and I've never enjoyed the program. Family Guy is better, but I sometimes find the episodes seem a bit.. stupid - Family Guy over the Simpsons however.
Out of loyalty, I'm going to have to say the simpsons. Family guy is hilariously funny in a more inappropriate/random way but the Simpsons has this more subtle/mature funniness that I'll always love. It's so quotable haha
I'm gonna have to go with Family Guy, as I've never really watched the Simpsons and never got into them as much. Family Guy is just god damn hilarious. Simpson's I never thought was as funny.
Family Guy is literally one of the Top 5 worst TV shows of all time. It's just horrifying. I don't really like the new Simpsons, but the old stuff is pretty classic.