NO I am wondering which of these is the best to use
Best to use for what?
If you're just talking about automated posting, then any of them work just fine. If you're talking about user interface, that's debatable. If you're talking about features at a lower cost, that's subjective.
For me, I use two of the tools on your list - Hootsuite and Buffer - but I use them for completely different purposes.
Hootsuite I use for scheduling posts on Twitter & Facebook. I also use it for posting articles or sites that I find interesting. I use Hootsuite for brand monitoring also.
Buffer I use only on Twitter, and usually this is for reposting articles that are in my feed. I have configured buffer to pull articles from places I follow, and then I can cross post those articles on a schedule.
Hootsuite has a similar feature, but the viewing of the article and then scheduling is easier for me on my phone in Buffer.
I also use Feedly to push articles that are in my feed, but that's not exactly a Social Media Management tool.
So, as Steve said, "for what" as it's relative to answer the question.