Almost everyone on this site has removed swirls with the 7424/7336 (same machine, different CW). It's the most popular random orbital around by far. Having recently started detailing again with a rotary I find it isn't so much that the PC7424 can't remove the same degree of marring as a rotary more than it takes much longer. A rotary *can* remove slightly deeper marring, but the main advantage is it's speed. With it you can do one entire pass in 30-40 minutes whereas with the PC you might take 3x as long.
The tradeoff is that a rotary requires much more finesse. There is a higher potential for damage since it removes paint so much quicker, there is also the potential of halograming the paints finish etc... A RO like the 7424 is virtually fool proof, it doesn't have the power to burn paint (unless you clip a really thin edge or something), it'll bog down before it can create halograms...
So ya, I'd always recommend the 7424/7336 to beginners. First, it's easy to use. Second, there is tons of info on how to use it. Third, it's esentially impossible to damage paint with it. Forth, even if you move to a rotary in the future you will still use it. I still use it almost every detail for finishing polishes and wax/sealant applications.
Cheers.