I have the 48" wire crate with the divider. We used the divider while he was little and growing, but I can't say whether is really aided in house training. He is often in the crate home alone for four hours at a time, and that was more than his little bladder could handle. The divider is a nice feature if you have it, because you can constantly "right size" the crate. They need only enough room to turn around and stretch out comfortably.
Stainless steel - if you like the look of ss and want to spend the extra $ fine, but I don't see a practical difference.
One important consideration though - the gap in the bars is about 1 1/4 inches, too wide for a new puppy (can get nose and snout through and could injur or traumatize). I used an inexpensive travel style crate until he was big enough for that not to be an issue.
Stainless steel - if you like the look of ss and want to spend the extra $ fine, but I don't see a practical difference.
One important consideration though - the gap in the bars is about 1 1/4 inches, too wide for a new puppy (can get nose and snout through and could injur or traumatize). I used an inexpensive travel style crate until he was big enough for that not to be an issue.