..This is another of those topics thats been debated over and over since the dawn of time, basically, with the same basic arguments, pros/cons being mentioned every time.
I sometimes wonder if folks just ask this question for the entertainment of watching folks 'debate' the issue. :)
Naturally, those that use a dolly will highlight how versatile the dolly is and how it allows them to tow almost any FWD vehicle without modification, and saves them a bunch of $$. They will downplay how much more effort it requires to hitch up and unhitch, and how much more of a pain it is to store, maintain that dolly.
And, of course those that tow flat will highlight how much quicker, easier and simpler it is to hitch up and unhitch, and that they don't have any additional large hardware (dolly) to have to store, maintain. They will downplay how much extra $$ they spent setting the vehicle up for such, and the modifications (base plates, wiring, brake system, etc) they had to do.
The debate goes on and on. Bottom line is, like so many have said: There is no one size fits all. You have to decide for YOU, which 'pros' you must have, and which 'cons' you don't want to deal with.