All telescopes are good because they are tools that enable us to observe the universe. Each design has its own pros and cons. There is no perfect telescope or else the other types would no longer exist. If you want to go deep and see a lot of DSOs, then aperture is what you will need more than anything else. Myself, I am not out there trying to find/see every DSO in the star atlas. I am more interested in spending quality time under the stars and experiencing the awesomeness to whatever degree that I can, with whatever equipment that I happen to be using at that particular time.