This is my first time here, please help. We are travelling (2 of us) MAN-SEZ via DXB in economy, on flights EK20/EK707/EK706/EK19.

I always used seatguru to choose the seats, but this time the seating plan on the emirates website (choose the seat) and seatguru website is not exactly the same for one of the flights!

Emirates website gives the following:
EK20 - Boeing 777-300ER, 2-class, economy starts row 7! (How are seats 23E & 23F?)
EK707 & EK706 - Airbus A330-200 (same as on seatguru, chose seats 35J & 35K for both flights?)
EK19 - Boeing 777-300ER, 2 class, economy starts row 8. (Which seats to choose? Wouldn't mind window, as it is a day flight - although, how much can you see?! The 2 seat rows at the back are all taken. Currently have 12J & 12K assigned)

Can someone please help with seat selection? It is our first flight with Emirates, so have no idea what to expect!