The xi is actually a considered a fully automatic full time "all wheel drive", with an automatic uneven distribution front and rear. More in the rear, less in the front. This is so there is no wheel "jump" when the front wheels are fully cranked left or right in a dry, non-slipping situation. If anyone has ever had a real 4x4 (like a Jeep) they know what I mean by wheel jumpingin turns.
If you live in a snowy climate then the xi might be a good option. Otherwise I would go with a regular i or Ci for better all around performance and handling.