Hi Roxicus, yes thats right you often see players with a slightly different wrist position especially whennyou compared blocking or topspin shots for example. Usually for topspin shots you want to have the wrist in the position in the first picture so pretty much in line with your forearm, this allows you to be relaxed and make use of the wrist just before contact and accelerate into the ball.
Sometimes for blocking or driving players find it easier to be in the more upright position as you showed Dan in the second picture because as you said the wrist is more fixed adding stability. So my answer is really rty to be flexible and experiment with which wrist position feels best for you on blocking and topspin shots to find a comfortable balance. Try to avoid locking the wrist completely as this will make you tense and it’s thennhard to adapt, simply having a stable and comfortable feeling is enough.
