Hello Hassaan,
I wanted a 200mm newtonian for astrophoto for about a year. I checked many discussions/content available about it. From the quatro to the very expensive artesky 200.
I ended up buying a tecnosky carbon series 200 which is another rebrand of the GSO carbon 200 (same as apertura).
From the content I read about the quatro, there was too much modifications to do in my opinion (RAP focuser, CNC spider, back cover….). I mean the price of those item (especially a good RAP 2 inch focuser) would make the “cheap” quatro almost the same price as a GSO. Also, I think a carbon fiber composite tube is a nice advantage for this aperture size.
I’m really happy with the tecnosky carbon series 200, I’ve been using it for about 2 weeks, I’ll publish my first light soon (I need two more good nights). I also added a primary mirror mask (cheap 3D printed), the mirror came with new springs for primary collimations screws but I did not changed them yet).
About collimation, as I feared this might be an issue, I bought the Ocal camera. The process was very confusing at the begining, but I now understand it and was able to achive a very good collimation that holds for multiple nights (I move the scope in and out every night).
I hope it helps!
CS