elite has more toys, so is heavier, so slightly worse on juice, but has softer suspension, so more comfortable
MV6 is sportier, so less comfortable and less toys - might be better on mileage, but, on the other hand, will tempt you to drive with a heavy foot, so might not be.
Most noticeable difference will be in the seats.
mv6 has sports bucket seats with an adjustable knee support (dunno what it's called). I think the elite just has standard "car seats".
BUT: they are more similar than different, and I recommend you concentrate on condition and service history than model.
A duff mv6 might be less "sporty" than a well set-up elite
A duff elite might end up with less (working) toys than an MV6, and a well-looked-after mv6 might have the toys retrofitted.
Similarly, an elite can be retrofitted with mv6 suspension and sports seats