Personally, I'm convinced that the one and only way to decide which distro is best for you is to try several, then make up your own mind as to which one best suits your needs and preferences. The quarrel I have with these kinds of these quizzes is that the answers are pretty much subjectively pre-determined purely by whoever put the quiz together - I would actively question how objective or reliable they are, and my concern would be that newbies might consider them to be authoritative, and thus be discouraged from trying other, possibly better suited distros. What makes Linux great is having the ability to choose what you want to use, and I would hate to think that anyone might decide against using Linux because the top distro recommendation from a quiz turned out to be unsuitable for their purposes, and that person subsequently concluded "Ehhh... this Linux thing isn't for me"
To be fair, I have no objection to using a quiz to get some potentially useful suggestions as to which distros may be of interest, but exactly like Arow's comment, the two distros I use nearly all the time are never presented as answers whenever I try one of these quizzes, and the answers that I do get are for distros that I (usually) have played around with but have decided against using for one reason or another.
In any case, I realize that not everyone either has the interest or time to install and work with multiple different distros in their quest to find out if Linux is for them, but at the same time, I figure if people have enough interest in Linux to actually seek it out, they'd be willing to try a couple of different distros on their own just to see what they're like. Overall, I think linking to something like the LQ ISO
is far more helpful and valuable than is "which distro" quiz. Don't get me wrong, I'm not criticizing these kinds of quizzes, but I think pointing a newbie to a group of distros is better than narrowing his/her focus to just one or two distros.
Strictly my 2 cents, as usual.