The ETX-80 will certainly be more forgiving because of it's shorter focal length and wider field of view, but the 90 is such a nice scope I think it would be worth the extra effort. If you were only interested in wide field imaging with light visual observing I might consider the 80, but for a more balanced mix of visual and imaging I'd consider the 90. I think you'll find the 90 is particularly well suited for lunar and planetary imaging where the targets are bright, they'll take full advantage of the 90's excellent optics, and the tracking issue isn't as important.