If you can find a place that will let you try on both the Etys and the Shures, that may be the best way to determine which one you prefer. The various Eymotic models (in particular the ER-6 and ER-6i) have slightly different fits, which in turn vary from the Shure earphones.

The sound produced between all of the earphones have different "signatures" and come down to individual preference (especially between the E3(c) and the ER-6/ER-6i). Bring your own music player with you as the amplifier in your device will have its own characteristics which may not be displayed with the in-store players.

Either way, if you can get used to the fit of the earphones, they're far superior to the Bose QC(2) in terms of sound quality and reliability. I would recommend getting an in-line volume control and an airline jack adaptor if you plan on using them with the IFE systems.