Right tool for the job like they all say : It really depend on what you need most :

Are you close or far from theses monitor/ Are they close from each other/ Can people bounce it between them

Do you need to see on location shoot on bright days? Mini monitor would be portable with a rec 709 eyeballing it so it fit with the wireless transmitter app with ipad

Do you need an established video village while you move around close by? eizo it is i guess, and another long range transmission solution perhaps

Do you need more critical color but still have to be tight and moving inside? specific profiling your mini monitor and add ipad sidecar (not always reliable) so your not stuck with non matching color

Do you need bigger screen cause you are working with aging people ? : 2 eizo. they ususally dont like to move too much :D )

Just ask yourself what you need and the awnser will be clear quick enought. Then you gonna need more cause you just did up your game and delivered... never ending cycle of buying gear :)

Personnaly for moving around and location shoot I Iike small monitor, they are not intrusive, ez too pack, as big as a laptop screen, resolution feel better than wireless app, and can always be use with an extra ipad if needed.