Leo, can I vote "neither?" I've owned a slew of Heads, have skied the Magnum though not the Titan, so not a hater. But you keep emphasizing ice, and these two are not optimized for ice. Yes, with a 1/3 tune, a plate, and solid skier mechanics (which you may or may not have at your level), they'll be fine. But that's different from being optimized for ice. Fischer Progressor 8/9's, Blizzard G-Power's, Supersonics or 8.1's, Dynastar Course Ti's, Stockli CX's or SX's, Volkl's Tigershark's, will all give better feedback and feel more planted on ice, less effort to manage them.
OTOH, if you're worried about handling ice, but actually stay away from it, Magnums will be a great all around groomer zoomer, and the KERS will give it a serious kick at the end of the turn if you like that. The Titan will be weirdly good in variable crud that includes patches of hardpack. These are fine skis. But they are not fine ice skis. OK?
In all honesty, your concerns and mention of level suggests 1) that lessons would aid you more on ice than any particular ski, and 2) The Magnum or Titan might turn out to be a handful if you find yourself in the backseat. Which many high intermediates do from time to time. As would a number of the ice skates mentioned above. The Stockli CX's, Progressor 8's, Tigersharks, or Supersonics will be the most forgiving.