I've had both, even at the same time.
The only benefit to a real boost gauge is that it reads at the intake manifold VS the other ones read pre throttle body.
Assuming your throttle is open, they would both be the same during pulls.
Where they differ is at low boost usually under 4 psi where the throttle blade will make an inherent false boost spiking on gauge hijacking. This is because the throttle blade is not fully open.
The gauge hi jacking would also not be accurate if you are getting throttle closures.
So the question is what is more important? For this vehicle I feel it looks a lot cleaner with the use of gauges from tunes.
If you really want to know what your motor is taking in, use a real boost gauge.