DSLR for sure. One of the great things about them is you can do burst mode and take lots of quick successive pictures. There is also no delay between hitting shutter release button and picture being taken. So I think it will be easier to get a better shot with the DSLR. Though your lens will limit your zoom, but if you can get a nice close (but safe!!) flyby shouldn't be an issue.

Though at the same time, just bring both and experiment, too. What me or others may think, may not be what is best for you.

Good luck!