Questions are always welcome. And even the most experienced people here ask more than they sit back and pontificate. It`s by bringing these things up for discussion that we all learn more.
That being said, Proper punching technique protects the knuckles during a punch....but proper punching isn`t natural and it has to be trained over a long period so that full power can be delivered into an opponant. Lots of people THINK they`re hitting full power. What they`re doing is using their full EFFORT, but because their technique is poor the impact potential is bled off before it transferrs into the opponant. But this talk isn`t about proper punching, it`s about palms vs fists.
I like both, but I use open hands more often because it`s easier to transission into grabs (which make the next strike more effective) and throws. I`ve never found open hand strikes to be slower than fists, just the opposite. Since my arm is more relaxed with the hand open it travels faster. Yes, the range is slightly less, but not significantly so. And because I`m a bigger guy I usually only use strikes in the first instance of an altercation anyway. After that I close to shorter range and depend on knees, elbows, grappling, and such instead of longe range punching. So the choice of fist or open hand isn`t really an either-or scenario in my opinion.
I do think that some type of regular hand conditioning is a HUGE help with both types of strikes though. Whether it`s as simple as working your strikes on the heavybag, or more traditional hand conditioning meathods. You need to build muscle memory to strike well, you need to create hand-eye-coordination, and learn to read distance to your target so you can strike properly. Of the 3 , I think the last one is the most important part of bagwork, and one very few people ever talk about.