JUST IGNORE THIS POST I got my names mixed up. My apologies to the OP. It's about Swarm versus Intimate Textures, rather than Swarm versus Intimate Strings.
Intimate Textures is progammable in real via a single Kontakt control window. With Orchestral Swarm one takes the more typical approach of loading in patches in multiple Kontakt tracks, or at least I do.
Intimate Textures is of course strings only, Swarm gives you strings and horns (but it's not a general case orchestra).
Intimate Textures is basically three user selectable string sections which can be violin, cello, bass or any combination of those, each with several patches like sul tasto, drops, etc. It's controlled by a very, very tricked-out modwheel thing that incorporates filters, variable reverb, etc in a programmable way. Both VIs have rhythmic elements, Swarm is a little more random and somewhat arhythmic and uses a normal modwheel scheme.
Swarm sounds much more orchestral than Intimate Textures. Intimate Textures tends to sound a bit synthy, Swarm always sounds analog.
Bottom line, they're not really comparable or even very complimentary. They do different things with very different sounds. I used Swarm as a Creepy-crawly Drama Toolkit in a nature documentary, Intimate Textures would have been less than useful there. I do like Intimate Textures, however, and I occasionally practice with it since I think it could eventually be useful.