I looked at BI and did not like the interface and it just seemed a bit dated although I am sure it is a great piece of software. I can't deal with the color scheme. I looked at DW offering, it was good but at the moment they do not have any native support for analytics or support in camera intelligence (trip wire etc) Although I was told it is coming early next year.
I found synolgy very cumbersome to use their NAS hardware specs were a limiting factor in terms of performance. I have been a Surveillance station user for the past 6 yrs on and off. (I got suckered into buying a few nest cameras glad I saw the light of day again).
With all that say, I bought a QNAP and have upgraded its ram and threw in a few purple drives in it and it has become my surveillance rig. I love the software (QRV Pro) IT is missing some features, but it brings to the table others.
It is a mix of Synolgy and DW. The hardware runs solid so far with 8 cameras 4-8MP recording 24/7. I am going to 4MP cameras but it has nothing to do with hardware not being able to handle 8MP.
Last but not least, they support Hikvision cameras natively - meaning in camera analytics. Unfortunately that is not the case with Dahua cameras, but they are supported otherwise. I have a good mix of dahua and Hikvsion so I am okay.
The only problem with QVR is that is you need 9 cameras, you can not just buy ONE more license. You have to pay up and purchase another 8 (for a total of 16 and some additional functionality)