Should I update to the new OS X?!

I'm using a MacBook Pro (Retina, 15-inch, Early 2013) with processor speed of 2.7 GHz Intel Core i7 and 16 GB 1600 MHz DDR3 of memory.

I tried to update my old OS X Mavericks to OS X Yosemite and after that my Mac became so slow and got many bugs and issues which after many questions that I asked here, someone suggested me to re-install my OS X and he said it should be fixed, it became better, but not totally fixed and I ignored them after times. But now that the new OS X has fallen I read reviews as many as I could, fortunately or unfortunately, about half of them were talking about how new OS X is terrible that made their Macs slower than before and they got much more issues, and the other half were 5 stars and said that what an amazing OS X is it also their Mac became so fast and really responsible after upgrading. That's what I want. However, it seems the users that updated their OS X from Mountain Lion and jumped to OS X El Capitan, they don't have any problems, but the others, which updated theirs from OS X Yosemite to new one, they faced with many problems. Is it correct?!

Now, I'm really confused, what should I do!? Should I leave my Mac by OS X Yosemite or update it to the new OS X!?