Hello ScarlettDiva and welcome to Ballet Talk!
The Orchestra stalls seats are almost always appreciably better than the amphitheater seats, but also a good deal more expensive. I've had good luck with the phone staff at Covent Garden - they're said to be much more helpful nowadays and I found that true, with the sales agent really helping me get the best possible seat available within my budget.
If you are purchasing online rather than on the phone, don't get seats very far to the sides - the sightlines at Covent Garden past around 10 seats from the "bend" in the horseshoe starts to cut off quite a bit of the stage - for instance, B34 in the stalls circle loses about 10% of the extreme left. All the seats in the orchestra should have a clear view.
I've found with Covent Garden, buy your seats as early as you can - as soon as you definitely know your dates will not change. Things can sell out there.
Please let us know what you see and how you like it - and tell us about the ballet you are seeing in Italy!
P.S. 3000 posts with this one. Whee! I'm an Emerald!