To my mind this is an either/or situation!
A number of factors can influence this e.g.
The height of the growing space for one.
Your location
Variety.
I tend to grow 5 trusses which fits in with the height of my greenhouses.
If I had more height I still don't think I would go anymore, because, in my area it might not be possible to get the top couple of trusses to ripen (if I grew to 7 trusses) so I tend to go for quality rather than quantity.
So really the choice is yours in my opinion!