Regarding styles comparisons: I gave a thorough comparison of Laver/Sampras/Becker.
It is not easy to analyze two or more distinct great players, even w somewhat similar styles. I thought the question excellent. I trust other posters will give thought to this, and will write. I think this one is my last contribution.
Two S/Vs that don't seem to fit with the above-mentioned trio (I analyzed Laver/Samprars/Becker) are Edberg and McEnroe.
Extremely, subtle, touch volleyers who set up their winners exquisitely, they could also hit "smart" bombs and "unguided bombs." Their respective refelex abilities and lunges were almost equal (though I might give the edge to McEnroe).
Edberg was cooler and seemingly more in control, but if stats were ever created on their respective careers, my hunch is that Mac would be equal or better on effectiveness, at least on total net points won (not S/V necessarily).
Which raises and interesting issue:
How to count Mac's points on aces or, more often, service winners, when it appeared he was going to the net, but it is a matter of interpretation? Mac was the more lethal server - thanks in part to the nature of an preternaturally angled left-hand serve to the backhand of a right-handed player (in those days, remember, the back hand was usually the weaker side [still is]). We all know this was Mac's biggest advantage against Borg.
Edberg did not have a "big serve". Perhaps in the the 117 mph or so, to be generous. But a great kick serve, and precision-like placement. The high kick serve helped him get to the net in plenty of time.
With his sometimes torpedo-like backhand ground stroke, I might think Edberg had the greater range of tools. McEnroe, in contrast, so often hit groundstrokes little stronger than "push" and "puff". But they were deep. The intentionallly iconolastic -in-the-extremis (the "Mouth that Roard") McEnroe could not then have appreciated that he was executing the prime maxim of the game's greatest gentleman, The Baron Gottfried von Cramm: "The mark of aristocracy in the tennis stroke, the mark of quality, is neither force nor rotation. It is depth." Junior hit his groundstrokes with depth.
It remains surprising that Junior did not win more Majors. But the explanations - too much time off, cocaine, Tatum O'Neal, his disheveled nature - make sense.
It remains surprising that Edberg - the only player ever to win the "Junior Grand Slam" - did not take a couple more Slams, another YEC, the WCT and a and a few more "Super Nines" Perhaps this is understandable to some extent. Becker overpowered Edberg. Also, to a lesser extent, did baseliner Courier, briefly, but when both were at their peaks. He lost the match he should not have lost at the 1989 French Open final - the match that would have completely changed our perspective on his career. Later, Pistol Pete was too much for Stefan.
Somewhat similar styles. But McEnroe seemed to have more fortitude (taking nothing away from Edberg's ultra-valiant defense of the USO in 1992).
And, Again The Davis Cup. Murray? Johnny Mac was superhero of three Davis Cups! Between 1979 and 1982, years of savage fights for D.C. titles, McEnroe went 19-3 in singles and volleyed two WGF finals hat-tricks in leading USA to three Cups. Stefan would not have been up for that. McEnroe cannot be ranked outside the top-10 all-time Davis Cup competitiors, and perhaps belongs a wee bit higher.
Similar styles. McEnroe superior. McEnroe I think better on the nuances of the offensive lob, a now non-existent shot for the most part.
Both magnificent doubles players, but, again, McEnroe the the more durable, consistent and effective, although, other than Mac, not sure there has been a world No. 1 singles player who was also No. 1 doubles since Stefan Edberg.
