I love Aurifil for piecing but I find it too weak for quilting. Even with piecing I do get some breakage with Aurifil.
Any machine as expensive as a Q20 should be able to handle any thread you throw at it. So I will offer my opinions but I don't have a Q20, I quilt on an Innova 26" that is rack mounted. My domestic is a Bernina and I have also used some of these threads with my Bernina with no issues.
What type of thread to use depends entirely on what look you are going for. My usual go to thread for quilting is Glide 40 wt polyester but it is a very shiny thread and you may not like that look. If I just want texture to show and not the thread I go with Invisifil which is a 100 wt poly. It is very fine like silk and also like silk very strong. It sinks down into the fabric so isn't as noticeable.
Poly threads that have a matte finish that I have had success with are Superior So Fine and Bottom Line and yes, I have used Bottom line in the top.
If you prefer 100% cotton Connecting Threads cotton is nice but it can be very linty. King Tut by Superior is also a very popular option. Especially if you like working with variegated threads. King Tut does also come in solids. You should try experimenting with lots of different threads to see what you like. Superior offers "try me" spools in just about all their threads. You can't choose the color but you get a steep discount.
https://www.superiorthreads.com/quilting-threads