We always talk about the Nadal FH --arguably the GOAT stroke.
Why not ask the actual guys who play against Nadal, Fed, Djoker and everyone else? Do you think they would be in a position to know? Then accept their verdicts.
Because this New York Times article is behind a pay wall, I'll cut and paste it:
Who Has the Best Shots in Men’s Tennis?
By
Christopher Clarey
The Times polled 10 active men’s players for this year’s survey along with 25 other experts, including coaches, analysts and former players. Each participant was asked to pick a top three in each category, with added weight given to the votes of current tour players and coaches.
Some of the respondents, like the big-serving American John Isner, answered off the top of their heads, basing their choices on personal experience. Others like Stephanie Kovalchik, senior data scientist at Game Insight Group at Tennis Australia,
relied on detailed statistical analysis.
No matter what the method, there was a lot of Djokovic, Federer and Nadal in the conclusions. Someday, the names at the top will change.
BEST FOREHAND
1. Roger Federer
2. Rafael Nadal
3. Juan Martín del Potro
4. Fernando Verdasco
5. Kyle Edmund
Honorable mention: Jack Sock, Karen Khachanov and Novak Djokovic
While Nadal’s forehand was the winner for former tour players and coaches, Federer’s was the overwhelming top choice by current ATP players. Over all, del Potro was a strong third. No one else was genuinely close, though anyone who has seen Edmund, Sock or Khachanov knows the younger set has big weapons.
BEST TWO-HANDED BACKHAND
1. Djokovic
2. Kei Nishikori
3. Alexander Zverev
4. Andy Murray
5. Nadal
Honorable mention: Benoît Paire, Nikoloz Basilashvili, Borna Coric, Daniil Medvedev
BEST ONE-HANDED BACKHAND
1. Stan Wawrinka
2. Richard Gasquet
3. Federer
4. Dominic Thiem
5. Stefanos Tsitsipas
Honorable mention: Philipp Kohlschreiber, Denis Shapovalov and Marius Copil
https://www.nytimes.com/2018/11/09/sports/tennis/who-has-the-best-shots-in-mens-tennis.html