Every amp company has a Flagship model.
and they change, as newer/more expensive products come out.
And, it's not because I own a VHX now, that I mention the Flagship tag.
I think it's way cool that you love your Diezel amps. They are all, each one, special amps.
I love my VH4. I'm still using it for recording.
And Herberts are awesome! I love their refined, modern sound.
I got the VHX to make gigging easier. It's made setup simple.
But it does fit what companies think of as "flagship"
doesn't mean it's better at all, just newest design + highest price tag
Good example, would be
Marshall JVM, it's the flagship,
but everyone knows the 2203, 800, Silver Jubilee, etc......are their best amps
At some point Marshall will come out with a new flagship model and replace the JVM as flagship.
We get to decide if it's better