This is not meant at all to be snotty or elitist, but I always took the point of view that if you have to ask Mac Pro or iMac, you should go iMac.
What about n00bs earnestly seeking information?
I was under the impression that was most of "them".
Computers classifications (DT, WS, NB, etc) aren't like skis or anything where one needs a "practice set" to learn on. Computers are tools. So, you need to get the hammer that fits the job. With all the models of PCs and Macs out there how else will they know if it packs a big enough wallop for their job(s) other than to ask those who have already tried it first hand?