First ever console or hand-held console I had was the old ass Nintendo Gameboy then the Sony Playstation then the Xbox.. so imo I can't choose between Nintendo, Sony, and Microsoft. They all have their good and bad points to them and all three made my childhood and present much more enjoyable. I might be biased on this decision because I am Japanese but I'd have to go between my homies Nintendo and Sony!!
Nintendo-because it was the first hand-held comp and the Pokemon games are just so precious to me.
Sony-because it was the first console comp and Sony just never disappoints... well most of the times