The current Pioneer trailers are an entry level unit made by Heartland, whereas the transcend is a new entry level unit made by Grand Design.
Both are smaller makers, Heartland you dont hear a lot about, they apparently dont generate the derision you hear concerning some lines. Quality appears to be on a par with industry standards.
Grand Design has established itself in the time its been around as being somewhat above average in quality. The general comments tend to be positive on their customer service and support, which is something seldom heard on these boards.
If all else were equal and I were looking at both units, I would probably lean toward the Transcend. My one concern with it is that their switch on this line to aluminum siding is different than all their other units and lines.