So basically since Gretzky left the Oilers? Because any Gretzky Oilers team would be better than any team since. I'll give it a quick go:
1. 2002 Detroit (best team money can buy, stacked with HOFers)
2. 2001 Colorado (stacked with high end talent)
3. 1997 Detroit (with the Russian five and Vernon)
4. 2000 New Jersey (deepest offense combined with the defense)
5. 1992 Penguins (a more complete team than 1991, Jagr also better)
6. 1991 Penguins (almost as dominant as 1992)
7. 1994 Rangers (stacked with former Oilers + Leetch + Zubov)
8. 1989 Flames (finally broke through - stuck in same division as the Oilers)
9. 1998 Detroit (not quite as good as the 97 team)
10. 1999 Dallas (one of the top teams finally won the Cup)
11. 1996 Avalanche (lots of high end talent and clutch players)
12. 1990 Oilers (not as dominant after Gretzky left)
13. 2008 Red Wings (dominant at both ends of the ice)
14. 1995 Devils (dominant defensively and dominated the playoffs, underrated offense)
15. 2007 Ducks (dominant defensively, questionsable offense)
16. 2009 Penguins (high end talent and not much depth)
17. 2004 Lightning (high end talent but not much depth)
18. 2003 Devils (all their key players were past their primes)
19. 1993 Montreal Candians (average team other than in goal)
20. 2006 Carolina Hurricanes (came out of nowhere then fell to earth the next year)