Have been lurking here on and off for the past year.
New user of a 30D and absorbing as much info every day and shooting experience as my brain and eyes can handle.
I do aerial photography with a remote controlled helicopter incl spherical pano's.
Heading on a 1-2 year north to south america driving excursion (leaving next year) and looking to hone my almost nil ground photog experience to something workable on the road within the next year.
For gear I went with the 30D because we'll probably shoot a lot of surfing/water sports.
For prime/macro lenses, I haven't had the opportunity to get something together yet.
For a carry-around tele/zoom between these two guys :
200L and 300 EF IS
I realize there are a million posts pro's/con's as I probably read most of them (long nights and strained eyes) until I could read no more.
I bit the bullet, went out and got them both and will see which one I prefer and then sell the other.
As with most people asking the question... which is better.... I quickly learned that it will depend on my personal taste, subject matter and wallet size.
That's about the one piece of advice I can give to anyone deciding between the two (70-200/300 zooms seem to be the 'in' thing these days) :
Try them both out if you can. They are different.
This site has been an invaluable wealth of info and a great tool.
Looking forward to reading more and posting.