No, what you don't understand is that the government gets theirs no matter what. In the Candian system they take it out right off the top in the US they take it after the fact. Either way the government is making money. There is no difference.
Besides that, the US Jackpots are higher. The minimum Powerball jackpot is 15 million. I believe the minimum Canadian is 4 million? Even if you took 50 percent right off the top of the US jackpot you come out 3.5 million more than the Canadian jackpot.
Canadas record Lottery payout with no taxes taken out:
$54.3 million
Us record lottery with taxes taken out:
$177 million (approximated after taxes)
Which one is better? I'll take the US.