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Answers will vary on this but bigger planes fly at a higher altitude, which usually results in less less turbulence and shaking so in that respect it's somewhat safer. In addition, larger aircraft have more engines (up to 4) while smaller aircraft have less engines (as little as 1) so if oen engine goes out, your chances may be higher on a bigger plane.
In the end, more qualified pilots will fly larger planes so they may be able to react to emergencies with more knowledge and experience.
Is there any data or evidence to suggest that the aforementioned aircraft(CRJ-700 or Embraer 190) are less safe than the other aircraft mentioned? I fly both these aircraft frequently but am considering not flying these aircraft any longer. Specifics would be of interest as this may change my flying habits substantially.