Hi Thomas. I suppose like most answers, it depends.
I am not overly familiar with panel antennas, so take this all with a grain of salt. We are usually using horizontally polarized on these bands and I'm not sure what panel antennas are or if they are "flippable". For portable work, most rovers are using loop antennas like those from Directive Systems https://directivesystems.com/ . Loop antennas generally cover the bands from 902 to 3400. Myself, when roving, I have had good luck using Directive System 6' boom loopers. For my home station I also use loop antennas on these bands but with longer booms.
For 5.7 I use a 27 dB wire mesh commercial dish .... you can find these all over the place online. One advantage is that they come with a feed and they are lightweight and low wind resistance (important sometimes when roving !).
For 10GHz I've been using a re-purposed 24" dish with a home made horn feed.
So overall, an advantage of a dish at this frequencies is that, in theory, you could use one dish and change out the feeds, or for some bands have a dual band feed. Getting gain at 2.4 GHz does requires a bigger dish, something that could be challenging to handle when portable and dealing with weather; that's why loopers are pretty nice for that application.
Hope this was helpful. Others may have some comment as well.
73, Jon
W0ZQ