[Tenrocca]

Im only guessing (haveing not built either), but I wouldnt expect the harrision to be any more difficult to build then a drb.

Performance wise I think the Harrison is a proven performer, this years nationals will be interesting to see how some of the better sorted cars go. The opinion of most is that the harrison has a better shape then the drb - although it is certainly not perfect (If there was a perfect kit, not just shape, in Oz, I dont think anyone would ever consider importing one from the US - see other recent thread)

All I can suggest is you really MUST see them in the flesh, and talk to as many people as you can to make a well informed decision.