None of these were my favourite. I fucking loved the Slitheens <3 I guess out of the options, I like the Daleks the best cause they're the most iconic to me (plus their little sassy bitchfest with the Cybermen is pretty entertaining)
The silence. But cybermen, out of those. Esp cuz of that one Torchwood episode where the cyberman turned this girl into a cyberman who then tried to turn some other guy into one, got done half way, one of the biggest wtf moments I've had watching tv.
Out of these, the weeping angels. They're the only ones that actually scared me haha. I like the Daleks too, but more because I find them hilarious and can't take them seriously haha. but my absolute favorite are the Silence. *shivers*
I can't remember what they are called but it's those little bugs that lived in the shadows and devoured everything instantly but couldn't enter any form of light. I just remember they were in a library. Dammit, now I can't claim to be a nerd anymore.