General Speed+Fluidity: Win 7.5 (7.8 isn't released so I won't be able to tell)

FM transmitter: Belle

Camera: WP

Display: E7 is a 4" panel with a 640x360 res while 800 is a 3.7" panel with 800x480 res however E7 is pure RGB compared to the pentile on the 800 (you choose who wins; although if you ask me my n9 display is something I like more so the 800 is IMO nicer to look at)

Apps: You see what you want from both the stores (WP has more but maybe in India Belle has more local apps)

Storage: Same

Keyboard: E7 has a hardware keyboard after all

Size+Weight: related to your keyboard preference


Overall, WP7.8 is as dead as Belle with the caveat that the 800 has a faster processor more RAM so on pure UX maybe the WP is better than Belle Refresh on the E7


Why not head down to a Nokia store try both? Try the 808 in place of the E7 but do remember you are going to get a slower 808 in the E7...Also if you don't intend to keep either might as well confirm the resale price at your place and maybe even agree to a deal to sell first so that you get the most bang for your buck...