Both will be excellent.
Last year I had the privilege of presenting at both. This year, ILUG asked first, so I'm going to ILUG.
DNUG speakers include Kevin Cavanaugh, Brent Peters and Bob Picciano.
ILUG speakers include Alan Lepofsky, Ed Brill, Myself and a few other hard-working and fun-loving IBMers. Notice how ILUG got all the good IBM bloggers :)
ILUG is free, and I think there are a few spots left, so hurry on over to their website to register.
ILUG is a lot more relaxed than Lotusphere, where we are not allowed to do things like toss out give-aways into the audience during our talks. ILUG has to such restrictions, and in fact, in some sessions they hand out beer when you walk in the door! While I do not plan to give out beer, I do plan to bring several give-aways to bestow upon the Lotus faithful. This might be in the form of a "pop-quiz" about what is coming in Notes 8.5. The desgn team and I have posted quite a bit of what is coming in Notes 8.5 to this blog, so read our former posts to prepare (hint: It also never hurts to know the names and job roles of our design personas, especially new newer ones, like Ida, Fred, Raj, Michaela and others...)