I'm looking at building a Changeling Wizard for a new campaign. While I'm likely to still take at least the first level of the racial substitution for the delicious skills, I'm less sold on the Dual Specialization feature. Illusion and Transmutation are likely the schools I'll favor, but anytime I seem to have a choice on which Specialization to choose (either UA ACFs or Master Specialist esotericas) it looks like I'll want to pick the Illusion option each time. All that leaves me with is the option to memorize an extra Transmutation spell rather than Illusion, and that doesn't seem worth the extra Restricted School. Am I missing something about how this works, or am I better off just sticking with Illusionist?
Notes: I know that Transmutation is the better school overall and Whisper Gnomes are the "superior" Illusionist race from a strict CharOp perspective, but I'm sold on Changeling at this point. I'm willing to be sold on the Transmutation specialization options over the Illusion options, however. They just don't look nearly as useful to me.