Delta's 777-200
 

We're flying on this plane in economy class and I have plenty of time to change my seats. Of course the emergency rows are not available, but just about everywhere else is. Isn't over the wing usually a more stable ride? I sat in the rear of the plane my last transatlantic flight and was sick when we descended. I've also checked seatguru.com, but does anyone have advice for the best ride? I was thinking the last row in the first economy cabin section? Thanks!

Actually, the rear of the plane is usually the most stable.

I am not sure it matters to be honest about it. The Delta 777 is so uncomfortable I will not ride in one again unless there is a dire emergency.
It was almost as miserable as a Delta MD 11, which the 777 replaced.

I would avoid the tail section if possible because you do get the maximum effects of pitch, roll, and yaw back there.

Usually you cannot recline your seats in the last row of a section, if that is important to you. I would think it would be on a long flight.

If you have looked at seatguru.com, as you said, you should have noticed that the last row of the first economy cabin (i.e. row 40s and 41s) are not good, due to proximity to the bathrooms.

Just get the seats closer to the front. The rear of the plane does move a littel more, as brookwood says.

Also note that Delta still has two different layouts, 3-3-3 and 2-5-2. Keep that in mind when you choose your seat assignments.

For all types of places: The closer you are to the center of all three axes -- front to back, top to bottom, side to side -- the more stable you will be. However, the arrangement of that axis depends a lot on where the engines are as well as where (front to back) the wings begin and end. As a rule, you should be most stable over the wing, but that's more true if the engines are also on the wings, as they are on the 777. If the engines are toward the rear or in the tail, then it will be more stable back there BUT also more noisy and probably more cramped.

I try to be on the leading edge of the wing when possible, for stability but also in part so I can see out and orient during turbulence and landing (which can always give you a "lift" and drop).

However, if you are on a "wide-body" and you don't care about seeing out the window, the more toward the middle, the less sense of major swooping when the plane banks. But as you know, a middle seat is often really claustrophobic, so weigh the trade-offs.

The best seat information can be found at:
http://www.seatguru.com/

I love seatguru but it gives no information about stability, turbulence, etc. (except possibly for a particular type of craft in general, but certainly not for individual seats).