I strongly advise to take advantage of the situation and take the EEA route.
Apart from the fact that is will be slightly easier and more of a foregone positive conclusion, the "Family Permit" and subsequent "Residence Cards" will be free of charge.
If you weigh this against the Settlement Visa fee, FLR fee, ILR fee, Britishness Test fee, and breathing fees, you save yourself a tidy packet.
Besides , if your wife intends to work, she would be entitled to do it from the moment she steps out of the plane.