I've owned and wore three TE2's, an FX, and an AP. I've tried on an RT and an ANHv2, and I've seen an MRCE in person. The only bucket I haven't held in my hands is a TM.
In general the AP & TE2 are the same size. The RT is a bit bigger overall, and the ANHv2 between the RT & the FX. If you use the search feature you can find the comparison thread I created for ANHv2-AP-TE2.
As for what "fits" much has to do with the pull, how it's assembled, and how it's trimmed. Lining up the TE2s, AP, and RT the "largest" and "smallest" was the TE2 in terms of being able to put them on. See what I mean?
As has been said over and over, it all comes down to your particular sense of aesthetic. And, how well you get it to match the rest of your suit. A well done MRCE will look better than a crappily built AP, etc.