I am all for scientific thinking and empiricism, but those asking that question are being way to concrete. I mean, does it matter how much difference manifests quantitativley (we have plenty of data to make inferences and it quite clear that training in FSPS are less focused on evidence-based therapies)? It's a part of the issue of course, but it's ultimately the wrong question. What factors maximize and/or assist in the preparation for the practice of clinical psychological science? Which ones are we willing to sacrifice when educating doctoral level professionals? FSPS often, when we measure these things, lack them. They are choosing not to everything we can to maximize training. Is this a good thing or a bad thing?
It does make a difference. This is a very important question that simply inferring from other data is simply never a good strategy. These are important factors. If this field wants to claim to be a scientific field that deals with stats, then make sure you do just that. I am not a fan of FSPS oriented program, I like the Ph.D. route myself along with a select amount of university-based Psy.D. programs. Other than that, regardless of my personal opinions on the matter, I would say that having outcome data on variables that I already mentioned are important. You may have evidence that FSPS are less focused on evidence-based therapies, but it really doesn't get down to the "cognitive" factors. Is it because they are too lazy to learn them? School is too lazy to teach them? School's faculty members not competent enough to teach them? Students admitted are of disabled background? etc. I could go on an on about possible reasons why you are seeing the performances in those measurements that you are making inferences from. The point is, your answer, as well as WiseNeuro's is...simply, no, no one has taken the time to construct such a study.
You may ask, "how will this help, what is its purpose." Great question! Let's take a look at disadvantaged backgrounds, they don't typically do well in many standardized settings, this is an example of a variable that is weeding out these types of applicants from a profession that they could have attained and been a contributing member of, but were not allowed to because of our current standards and methods of evaluations. Looking at how certain socio-economic devastated students become the first ones in generations to earn a college degree is important, quantifying this data to show progression or trend is important, especially for prospective students to find out programs that typically cater to or accept these types of students. Also, data looking at disabilities or minority status is important so that admissions committees can either implement alternative pathways of admissions for disadvantaged students or again, to at least provide that as public knowledge to the "consumer" so they know if a program is a good fit for them in those regards.
You are correct in asking what factors maximize or assist in the preparation for the practice of clinical psychology, however, you should also realize that every applicant is different, and not set up in the most fair of situations, especially for students who have had documented/diagnosed learning disabilities growing up, or come from a generation of family that did not value a college degree much less graduate school. These students certainly did not have a fair chance in life, but they are making the most out of what they can within the confines of our current infrastructure. I would much rather entertain this perspective as a scientist vs. the idea that all Psy.D. programs are terrible and all Psy.D students are "Wannabe" psychologists or, less-than Ph.D. psychologists. Simply put, it is a different pathway to attain the same goal of becoming a psychologist. If we want to criticize Psy.D. programs, do it on the merit of stringent, operationalized statistics and variables.
I scored a 13 on the ACT in high school, had a 2.5 GPA, on paper, I was a functional idiot (for lack of a better clinical term). Given this, if I didn't find alternative pathways to gaining admissions and succeeding in developing my brain, logical abilities, etc....I simply would be worse off than I am today. This is why you and others may see a resounding theme in many of my posts, I personally like to accentuate these issues because I have rarely seen them being fully discussed on this forum compared to other view points or topics. Simply saying "it's because it's not a problem" isn't the appropriate response I should think.