Well this appears to be going well? Is the OP satisfied yet?
For me it’s easy…
Money
Magnitude
Margin
Synergy
PRAT
Soundstage
Timbre and tonality.
Significance
Value
Judgement, mine or yours?
Cost
Logistical challenges
Connectivity
Implementation
Design
Materials
Parts
Components
Room
Nah there’s more
Lots more, but hopefully, you get the idea.