I don't know if there has been any research, but I would imagine it would be impossible to keep this kind of statistic since, as far as I'm aware, hardly any of us routinely tell the DWP that we've completed the claim form. And then of course there are those forms that we complete but never hear of the result.
What you heard/read is probably likely to be anecdotal in nature and borne out of adviser's experiences. I would agree that, across all benefits, claims are less likely to encounter problems where advisers assist, even if it's just to make sure all the Is and Ts are dotted and crossed.
If it's specifically in relation to DLA/AA claims you're asking (or others where entitlement is mostly subjective in nature), then in my opinion I would say there is probably a good chance that professional assistance would yield a greater possibility of an award. However, there are so many variables to account for in both assisted and non-assisted claims that I can't imagine any research projects would be anything other than extremely difficult and only of limited value.
If there has been some research in the past, it would certainly make interesting reading...
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