Based on the box score, they seem kind of even. Kobe scores on more volume, and appears to be a slightly better ball handler and creator (which is true). Erving appears to be a very good scorer in his own right, and is quite a bit more efficient than Kobe, even in Kobe's most efficient season (relative to league average). He's also a much better rebounder.
I would still give Kobe the edge on offense simply because he put up near-Erving like points per 100 possessions with more shot-creation. Estimated ortg/%poss/drtg numbers for Erving and Bryant (normalized for 2009 stat environment):
Erving
1976 120.0 29.1 101.0
Bryant
2006 115.4 36.5 107.1
2007 116.9 32.6 110.6
2008 115.4 30.6 105.1
2009 115.7 31.1 106.5
However, Erving was still superb on offense and was also better on defense, so it's close (overall, his 76 season >>> Kobe's 07, 08, and 09). I'd probably side with Erving if he has a decisive edge over Kobe in on-off numbers.