Depending on what you want to use newsreader for. If you plan to download binaries ONLY, nothing beats the free powergrab. If you want download and also the convenience of reading texts, Xnews is best but Xnews is pretty intimidating to people who likes to be intimidated. It's not that hard to learn using it. In addition to that, Xnews hogs memory a lot and prone to crash. As long as you are aware of these issues and knows the trick to stay away from problems, Xnews is pretty OK to use but still not the best out there. These 2 are free, no trial no shareware, no nothing.
After reading the comments above about newsleecher, I downloaded the trial version of newsleecher to try out. I just un-installed it after 2 days of trial The problem is it does not have the text reader capability convenient for user. Other than that and the stupid count down at the start of the trial program (I probably would use more than 2 days to learn more if it's not for that annoying count down), it's pretty good program, nice user-interface. Until they have the text reader capability, I won't pay a dime just to have another nicer program. I want one to replace both Powergrab and Xnews, not to get another pair ie. newsleecher and thunderbirds or something similar in purpose.