Hello, I did a quick search of the forum and found no threads comparing the pros and cons of both of these feats when it comes to sneak attacks.
On one hand Shatter Defenses, the good thing about it is I don't have to use a full attack to get its affect, I could simply use Dazzling Display or a normal demoralize check, but I've noticed that enemies become exceedingly difficult to demoralize and some gain fear immunity outright(Is afflicting an enemy with shaken through demoralize affected by immunity to fear effects?)
Improved TW Feint, I have yet to see anything that was immune to feinting, the problem with this is that I have to be next to the opponent or only 5 feet away to use a full attack and get this(And then there is also the fact that I have to sacrifice one of my attacks to use it).
Finally I could get both, but of course its going to take some intensive feat taxes. I am not going for pure optimization here, and both fit the flavor of the character I am playing.
This is what I had in mind as a feat build if I took both:
1-Combat Expertise
2-Improved Disarm (I know not that good of a maneuver and very questionable on a rogue, purely flavor)
3-Persuasive (Using lots of Diplomacy outside of combat, and not to mention boosting intimidate)
4-TWF
5-Improved TWF
6-Greater Disarm (Might as well go the whole way eh?)
7-Dazzling Display (Weapon Focus through rogue talents)
8-Shatter Defenses
9-Two Weapon Feint
10-Imp Two Weapon Feint
Human extra feat-Skill Focus(Bluff) (Why bother with feinting without this)
Combat Feat rogue talent-Greater TWF
feat rogue talent-Combat Reflexes
Oh and he's a rogue with no archetype.