In the northeast where clear nights are rare in the long winter, and moonless clear nights even rarer, having two rigs is a game changer. However, owning two rigs definitely is not cheap, heck, one rig isn't cheap. To me these were investments that I gradually made over time, and if for some reason I need to offload them I can still get a decent resale price (which is a big reason to not skimp on quality).
I think it's a good idea to get a primary mount that supports OTAs at a longer focal length, and then get a smaller mount for shorter focal lengths. I currently run these two rigs that I keep assembled almost permanently, and I can switch cameras between them:
Rig 1
- William Optics Z103
- Skywatcher EQ6-R Pro
Rig 2
- William Optics Recat51, or Samyang 135mm (conveniently fits in the Redcat ring system)
- Skywatcher HEQ5
Cameras
- ASI ZWO 294mm pro (mono, can image on almost any clear night, and use Ha or SII with 50%+ illuminated moon)
- ASI ZWO 533mc pro (color, for "quicker" captures of broadband targets)
- A DSLR works too! My first astro-camera was a modified Canon T5i that I still use depending on the field of view I need.
The downside to operating two rigs is doubling the setup time and the stress that comes with it. Keeping as many components as possible assembled on the rig is key to efficiency. That way you just carry the pre-assembled rigs outside to its usual spot, eyeball the bubble level on the mount, and connect the power cords. And yes, it's also important to get a setup you can carry around assembled! If you're using a newtonian over larger than 6", it's probably not possible.
Hope this helps!