You have a number of scopes including the AT102ED which I believe is your latest. Which do you use most, and why? When would you choose the AT102 ED over something else?
I could overview my scopes but I don't have a 102ED so I don't think my experience is quite as relevant.
I know Ed has seen your observing reports but it might be helpful.
I ask myself all the time If I could only keep one scope which would it be? It always comes down to my 8" dob. My favorite objects are DSO so aperture wins. It can do a little of everything. It's good for planets, splitting stars, galaxies, globulars, open clusters. The fov is pretty wide, especially with 2" eyepieces. I leave it set up in the garage so it's easy to carry out and it's ready to go. It's nice and stable and with the 9x50 RACI it's great for star hopping. As a result It gets used the most. At times I just wish it was a 10" or 12".
Next is the AT102ED. I got it to use as a travel scope with my RV but find myself using it at home more than I expected. I have always liked the views through a refractor and it's a nice to have something that compliments the dob. Stars look different without the spider vain and the contrast seems better. With 4" of unobstructed aperture it shows a lot of open clusters well and does a nice job splitting doubles. At F7 it can go wider for larger objects. I adjust my targets to the scope so I usually view open clusters, doubles, planets & the Moon. I'll look for dso to practice finding them and work on my skills but I really use the XT8 for that. If I can learn to see them with the AT102ED, I'll see them better with the XT8. I also tend to take out the AT102 if the moon is out since I know I won't be viewing as many DSO.
Then I have a Stellavue Access 80. This gets used the least because it's not much harder to setup the AT102ED and I know I'll see more with that. The SV80A travels with me if I'm really tight for space. I can use it on a photo tripod with a ball head or fluid head so it is the smallest and lightest by far. I find myself using it for shorter sessions or when the Moon is bright and I know I won't be looking for deep sky objects. I'll look at the Moon, split some doubles and view brighter open clusters. It goes wider than the other 2 so it's great for large objects. This is my newest scope and I haven't taken it to dark skies yet but I would imagine it's great for scanning the Milky Way. This is one step away from just using binoculars which I wind up doing quite often, especially in the winter.
Do I need 3 scopes? Probably not. Sometimes I have a hard time getting them all out under the stars yet I still would like an ST80 and bigger dob
As Ed said, He chooses targets based on the strengths of his ETX 90. Using different telescopes probably forces me to look at things I may not look at with another scope. Plus a little variety is nice at times.