Phew! This question has come a lot [on this reflector and elsewhere]. I have both but more often take a EFHW for convenience despite slightly less performance. I’ve written in more detail on EFHW vs linked dipoles here …
Just to complicate the story nowadays I mainly take my Chameleon MPAS Lite vertical which performs well on 10MHz-50MHz compared to my EFHWs or linked dipoles [and in A vs B tests, sometimes better - vertical vs horizontal polarization better for a particular radio path?] and has a smaller footprint (good for busy summits) and is quicker to erect and pack away (good for winter weather).
There’s not much difference in rucksack volume between EFHW and linked dipole assuming same length of coax feeder same fibreglass pole (though I often use shorter pole with the EFHW). The vertical takes more rucksack space.