Compare/Contrast. Tumbler vs protobot

Well let's see here, the protobot was definitely harder to build than the tumbler.  The base was about the same though on the protobot instead of having two motors for each side, we only had one with a gear system.  The gear system wasn't too challenging to make though.  As I said the base was about the same for the two yet on the protobot we have also added an arm to pick up tennis balls for the tournament.  Now on the tumbler the wiring was fairly easy.  Yet on the protobot we were having several difficulties such as we were looking at the wrong page or we assumed that the wires were put on the same way as in the tumbler I.E. red wire to red wire but it wasn't and it was supposed to be red to black which took my group a while and a few tries to figure out what was wrong with it.  The protobot was harder really just because the wiring was more complex and there was more to it and more parts needed.  Also on the protobot when we did inventory we had to accommodate for what we already had instead of just starting from scratch which may or may not earn our group a penalty or two for extra parts.  Now the tumbler was rather easy and everything went mostly perfect. The only thing that was surprising and difficult would be driving in a straight line. Now for both of them really I wouldn't do much or really anything to go back and make it more "efficient" since both seem already really efficient and the problem with driving straight with the tumbler can be chalked up to human error.