EVF all the way for me! It eliminates distractions from the scene I'm composing, it cuts down on glare and light so that I can see what I am about to shoot, and I can see potential issues much better than I can on the LCD screen when holding the camera out at a distance from me.
One thing I love about mirrorless is the EVF and immediate Live View; I found Live View on a DSLR to be rather awkward and cumbersome and so rarely bothered with it. I also like having the amount of information in the EVF available to me that I choose, too, all right there at a glance.
For about a week I needed to use ointment in my right eye -- my "shooting eye" -- and immediately realized that it would not be a good idea to use my cameras with EVF at that time, as I sure didn't want to goop up the eyecup or the EVF itself! I used my iPhone for a couple of days, then my small RX100 M7, and just used the LCD screen on that camera for composing, etc. It did work, but I was reminded again of why I don't like using that method of shooting! In the bright sunlight I couldn't see the LCD screen at all, and I found holding the camera out in front so that I could compose the scene, etc., to be awkward as well. At least with a small, lightweight camera that was doable -- I wouldn't be able to do that with my larger A7R IV and most of my lenses!
I don't think I've ever bothered flipping out the LCD screen on my A7R IV -- just not my style! Usually I can manage to get the shot I'm after without needing to do that, fortunately. I'm getting way too old to be contorting myself on the ground to get certain angles, too, and while I'm still somewhat flexible, I'm absolutely nowhere near as much so as I was some years ago. Getting back up off the ground is not as easy as it used to be, even though I can still do it!
For me the EVF was one of the major reasons I found mirrorless cameras appealing. Ever since my first exposure to one -- the NEX 7 -- some years ago I found it preferable to an optical VF, even though at that time EVFs were still just coming into their own. Since then, some major improvements! Even at that it took me a few years to actually get to the point of making the complete switch from DSLR to mirrorless full-frame.
Mirrorless photography has other advantages beyond the EVF, of course: smaller, lighter-weight camera bodies without the bulk of many DSLRs, the ability to shoot silently when needed in particular situations so no more clack-clack-clack of a shutter, etc., etc.
The saying used to be, "once you go Mac, you'll never go back," and I think that for many photographers the saying now could easily be, "once you go mirrorless, you'll never go back," too......