Closest I've read to? Cookie. The best way I can explain it is, shes Cookie on steroids. She is fast with what shes saying, she doesnt backtrack, unless picking up new information, and adding to an old piece that shes already given; so to elaborate. I'd also go so far as to say, for most people, shes got a much better track record with predictions happening, and 'not' getting confused, when compared to Cookie. Dont get me wrong, please, Cookie is amazing too. But with Mattie, the information flows almost naturally, and it's step, by step, by step, as opposed to, "step... um... repeat... new step... um...". They're both good, but that's why I liken Mattie to Cookie on steroids. I tend to find her more accurate and detailed too. But I'd like to add that cookie has been very good, but can sometimes misinterpret what shes seeing but so far, it seems like something she (cookie) predicted months ago will pass soon (I cant clarify yet). But if you were to choose between the two, please choose Mattie. Nothing against Cookie. Shes so sweet. Shes just slow to explain, takes up time by repeating old things, and sometimes cant get a clear and concise interpretation of what's happening. I'd suggest taking a look at her thread. You can see roughly an even amount of people who have been blown away by her visions and predictions (I'm one of them!) But also some who get off the phone, pissed, feeling as though they've waited and wasted money for 5 minutes worth of information, after being on call for 25 minutes. Regardless of how I've spoken about her here, shes been spot on for me, so far, though! I am thinking that one detail was misinterpreted (mixed up two people), but doesnt change the overall reading. She's a bit pricey but has been VERY accurate for me. Your experience may vary.
From my own experience, and through religiously following both threads, over time, I feel, though, that Mattie is much more gifted in the sense that her predictions come through more often, she gets time frames very well, (cookie misinterpreted some of mine), speaks faster, gives more information, and is usually much more accurate with not only what shes seeing, but with how she interprets information, too. Also she doesnt repeat, just to repeat. You'll get more information out of Mattie. Youd be looking at about 6-something for Cookie, and 15 for Mattie (both per minute). Mattie is much pricier, so that's a big con toward the comparison, but I'd still say shes more worth spending 15/min on, that cookie is for 6/m.
Hope that helped. So far Mattie is up there as one of my favorites, and most accurate readers, but Cookie is really the closest I can compare to, from my experience. Good luck!