Most Helpful Guy
Alien is an excellent choice. For me it's The Exorcist. The Others and The Woman in Black also had nice creepy atmosphere.
The worst horror movie is Blood Shack. IMDb has info that explains some of the weirdness, but it's still awful.
Most Helpful Girl
I really enjoyed the Babadook, actually. I don't get scared that easily by horror movies but this one really got to me for some reason.
The worst one? Probably 'The Cabin in the Woods.' Found it really gimmicky and overdone. The concept was clever but the carrying out of it was just bad in my opinion.