Most everyone is familiar with with Abdul-Jabbar's sky hook, practically ompossible to block, I saw Wilt block it once, Nate Thurmond got to it maybe2-3 times over the years. Jamal Wilkes behind the ear shot was tough to block as well.
Elgin Baylor could "hang" in the air and shoot from the side of his head, real tough to block
Here's one few recall or ever saw, when Wilt first came up and for his initial 2-3 years he patented the fallaway bank shot, from either side of the lane, he would dribble a few steps away from the backboard, turnaround and shoot a 15 to 18 foot bank off the glass, Russell never could get to that shot. Wilt also perfected the finger roll that became George "the Iceman" Gervin trademark, he'll tell you that Wilt was his model
Connie Hawkins had the biggest hands and longest fingers I've ever seen by any player, he could literally wrap around the ball making it impossible for it to be stolen
Which are the toughest shot to block in your opinion?
I think Kareems Sky hook. If you are defending him one on one, there is no way you can get enough reach to block that shot before it is released. Plus his Kareems length really made it impossible to block consistently. The space created by his body and the angle of the shot made it very very difficult to defend
Both Wilt and Nate got the skyhook at times. Kareem said so himself(about Nate at least). I think I saw Bill Walton get it in a clip from 77 too but im not 100% sure.
And the hardest shot to blook would have to be Manute Bols "Space hook" or Ralph Sampsons sweeping hook. You could block it from behind I guess(Ralphs) since he kinds started it low but it would be hard as hell to do it straight up.
Also Jack Sikma, and Larry Bird who both shot from behind their heads a bit. And robert Parish jumper came from like 9'5'' in the air I bet. And he could body you while he shot it which made it hard to get off the ground im sure.