The Onion AV Club features both Manos and Troll 2 in its
'The New Cult Canon' feature this week:

http://www.avclub.com/content/feature/the_new_cult_canon_manos_the

The question: which is more unspeakably awful, and how is that
possible?

I've seen both films, and it's hard to say which is "worst." One of the
reasons for this is that I saw "Manos" with the MST treatment, and
"Troll 2" straight up. Manos makes for a wonderful MST episode, but
would probably be rather dull without the riffing, in addition to its
obvious ineptitude. I remember watching Troll 2 and thinking how crappy
it was, but I was somehow enjoying it. Dumb stuff kept happening, but
somehow it was interesting enough to keep me watching. The kid wizzing
on the food to keep his family from eating it, the infamous "popcorn
seduction" scene, etc. And the Druid "Creedence," even with her green
gums was a hoot.

Verdict: Manos is worse, as a movie, per se. Great MST episode, but I
probably would have not watched it all the way through if I had come
across it on TV without the riffing. Troll 2, though, was worth
watching, if just for the weirdness.