This is the top 3 for me.

1: Gamecube

I like the startup because the cube actually makes a G, then becomes the line in the G. I also liked the sound it makes, plus it had easter eggs no one would have thought to find.

2: PSP

I loved it because it was a step away from the creepy Sony startups for me

3: Xbox

It was mysterious, and was the only thing I could remember of the Xbox, 'till my Dad found it after missing it for 7 years.

My least favourite are the:

1: PS2

It was creepy with the Cube and colors thing, and I swear I could always hear a "WEEEEE!" as it ended.

2: PS1

Way too loud and creepy.

3: WIndows Vista

Wait, that isn't a console.

3:  Ouya

Just plain terrible.

The Wii U is bland, I really don't think nothing of it.

The Wii didn't have any start if I can remember.

The GameCube start is definitely the best, the sounds are cool and the formation of the cube is also cool.

The Xbox 360 start is alright, but, meh.

Nothing surpasses the music of the start of Windows XP though.

GC
PS2

Windows is a OS, not a console. So not Windows please.

PS1, it's just so haunting and cool. Gamecube is pretty neat too especially with the Easter Eggs.

PS1 is the only console startup to give me chills, so it wins. I like the Nintendo 64DD startup too, but hardly anyone would have even seen it. GameCube startup has a ton of little easter eggs in it which is pretty awesome.

Sony without a doubt. Even though the GC startup is awesome too.

It was an extra :b

GameCube is number one, for me. Sega Saturn is a close second.