Topspin:
To me, topspin = swing path to contact (assume square racquet face at contact for this discussion)
Swing path = hand path + racquet head path
Any discussion about "which grip helps more with topspin" is really asking which grip makes it easier to hit the max low to high swing path to contact.
I would argue that how much you allow the racquet head to drop below the hand on forward swing, matters more than the grip when it comes to topspin. I will use my 40+ year flattish 1hbh as evidence for this at the bottom of the post.
This is what I mean by rh drop below the hand. Obviously we can find more extreme examples ... just think Nishikori on some of his 2hbhs.
You can hit pretty good topspin ... any grip ... with just a low to high hand path, with the racquet head level with hand during the swing. You can hit really good (technical term
) by dropping the racquet head below the hand on those low to high hand swing paths.
Here is one of Edberg's from the video above. You would miss it watching live.
Here is a couple of
@Curious rh drops ... I didn't check all of them.
I don't coach ... so my opinion on this is from online technical discussion/video, and what I have experienced trying the "extra rh drop". I pretty much abandoned my 1hbh drive (not slice ... 1hbh slice is the meaning of life and my path to winning
) for the last 2+ years converting to the 2hbh. I probably hit less than a couple hundred 1hbh drives in 2 years ... and you know I live on the ball machine. I had avoided the big rh drop on the 2hbh, because I didn't think that was my path to a repeatable low UE 2hbh. I decided to add it to my ball machine sessions this spring because I have come a long way on the repeatable thing. I honestly just expected a "little topspin" bump on a given swing. That is not what I found. I got a big jump in topspin for the same swing by just letting the rh drop as the forward swing starts (limp relaxed drop). Bottom line ... I can't match the spin I get with the rh drop with ANY low to high hand only swing path. The other thing is ... it's a more effortless topspin. And yes ... it's a more difficult thing to time, I still wouldn't recommend it at the start of the stroke learning curve. That said ... for me at this point, it was easier to add (still in progress) than I expected. Some early rash of mishits ... but that settled down pretty quickly.
OK ... back to the 1hbh. I had hit a bunch of 2hbhs on the ball machine the other day, and was pretty much ready to pack up and leave. For whatever reason ... the Dimitrov 1hbh pic popped into my head (that's Tomaz's Feel Good Tennis btw). My thought was ... "I wonder if I can get the same topspin adder on my retired 1hbh with the bigger racquet head drop?" It only took a dozen swings to have the thought "MF ... why in the hell didn't someone tell me this when I was 20 years old ... MF MF MF".
Size of racquet head drop matters.