Just to throw out a couple of items/clarifying points...
The 10 finger grip basically is the same as the interlock or overlap with the exception of where you put the pinky of the lower hand. If the pinky of the right hand (for righties) is on the grip instead of overlapping or interlocking the left index, you are employing a basic 10 finger grip. It is the least common grip amongst the professional levels, but there are many examples of people using it effectively at the highest levels. One current player using a 10 finger is Scott Piercy on the PGA tour. He is a recent winner and you can find info on him and watch his swing on YouTube if you so desire. Jhonny Vegas also uses it sometimes (per vid and pics I have seen) but sometimes it looks like he is using an overlap also so I wouldn't call him an all-in 10 finger guy. Art Wall (has the most hole-in-ones in history) also used the 10 finger, along with Bob Rosburg and Dave Barr. There are others as well.
A true baseball grip has the thumbs wrapped around the shaft, at least on the top hand. A recent example of this is Tommy Two Gloves Gainey - look at vid and pics and you'll see what I mean. As a righty, he has his left thumb wrapped around baseball style. This is a throwback to his baseball playing days, as he has stated in interviews.
Interlock is popular on tour - Tiger and Jack used it of course, but it has also seen somewhat of a renaissance on tour. You can also find it employed by some of the young guns like Rory McIllroy, Rickie Fowler, Bubba Watson, and Nick Watney. Pretty sure Paul Casey also uses it. Those are just some I know of off the top of my head.
Overlap is the most popular of the 3 grips used at the pro ranks. Many examples like Phil, Steve Stricker, Ernie Els, Adam Scott, etc.
I think its incredibly short sighted to say any of them are better or worse than others. Everybody's swing and body is different - its probably best to experiment then commit to what works best. Do that which gets the ball in the hole in the least amount of strokes. Last I checked score cards do not contain a notes section where you indicate which hold you used for the round. That being said, research is good because there are considerations to be made regarding complementary steps you can take to match with which hold you use. I would agree with a previous poster that indicated that often times 10 finger gripper benefit from using slightly larger grips than what they might otherwise to compliment the added hand action they might get - this is a generalization though and might not work for everyone.
But that is what is fun about golf - you can spend a lifetime tinkering with all the possibilities out there. No other game is like this, as far as I can tell.
Sorry for the novel, hope this helps someone.