Whizzy vs Whizzo - What's the difference?

As adjectives the difference between whizzy and whizzo

is that whizzy is nifty; impressive, often in a superficial or showy way while whizzo is great; super; wonderful.

(er)

(informal) Nifty; impressive, often in a superficial or showy way.

* 2003 , Brenda Laurel, Design Research: Methods and Perspectives

Many workers in research and in design start their efforts by falling in love with a whizzy strategy — or worse yet a mere tactic...

* 2005 , Mike Southon, Christopher West, The Beermat Entrepreneur

Remember that the ultimate judge of any commercial offering, from a corner shop to the whizziest internet application, is the marketplace...

* 2007 , John Hossein Ghazvinian, Untapped: The Scramble for Africa's Oil

...creating a sort of African Saudi Arabia where the world's poorest and most dispossessed are catapulted into a whizzy tomorrowland...

(en adjective)

(UK, informal, dated) great; super; wonderful

* 1955 , Margaret Erskine, Old Mrs. Ommanney is dead

"Oh, whizzo !" said the young man, springing to his feet. He led the way across the grass.

* 2012 , Patricia Cooper, Dear Cedric

But I didn't tell them about what you gave me. It was whizzo , super-bang-on. Thanks.

* Old-fashioned schoolboy slang.