When you say "Playstation" which one? PS1, PSP, PS2, PS3, PS Vita, PS TV, PS4?
And "Best", meaning what?
Best in terms of powerful hardware? In which case the XBox One is the best, followed by the PS4, and then a long, long ways off would be the Wii-U and even further off, the DS. (you do realize the original DS is 15 years old, right? Even the 3DS is pretty old.)
Best in in terms of sales? In which case the combined product line of "Playstation" would be way out in front, followed by the DS, then XBox 1, and then way, way, way behind in 4th place would be the Wii-U.
Best in terms of number of games? Again, "Playstation" wins by a huge margin, followed by DS, then Xbox-1, and Wii-U.
If you're just looking at PS4, then DS takes first place, then PS4, then Xbox-1, then Wii-U.
Best console for playing Uncharted 4? PS4 comes in first place and the other 3 don't even place.
Best console for Halo? Xbox1, and the others don't even place.
Best console for Bayonetta 2? Wii-U can finally take first place for something.
Best console for Pokemon? DS, but the 3DS kicks its @ss.