ORIGINAL: scooterinvegas
The apprentice is 14" wider and 10-15 oz heavier. Even with the bigger motor it might not be faster or "more powerful". I would buy the T-28. They fly great stock, and most hobby shops can get parts faster. Two of the LHS I go to stock most the parts on the wall.
Plus, when you get tired of the stock T-28, just add a E-flite power 15 or 25 and a APC 11X7-E and it will fly like a newer/faster plane.
I've been leaning more and more toward the t-28. I already have a transmitter and the t-28 comes in a BNF where as the apprentice doesn't. I've read the t-28 is docile enough to be a good second plane (or first plane with ailerons) but still peppy enough that it can be really fun when pushed a little.