I don't have either one of those, but here are some thoughts to consider...
-safety...is it fully enclosed? a safety tether? I have little escape artists!

-enough ventilation?
-comfy?
-does it meet the standards for most airlines?
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The fullness of our heart is expressed in our eyes, in our touch, in what we write, in what we say, in the way we walk, the way we receive, the way we need. -Mother Teresa (
RIP Gizmo 3/9/07-8/18/12)