I already have the Logitech MX Keys and Logitech K780 keyboards, along with the Logitech MX Master 3S and Logitech M720 Triathlon mice. Lately, I’ve been using the K780 and the M720 because they’re my favorites.
You don't have to be bipolar to get that urge to spend money and try something new (though I know it can be a symptom); I'm not, and fight the urge to get a NAS. Not because I need or have much practical use for one, but because I've never worked with one and it would be an opportunity to 'learn by doing.' I need to settle for the flat ethernet cable and clips on order so I can run a line from my router to Mac Mini, where the wifi signal is 'fair.'
Why do you prefer the K780 to the Logitech MX Keys? If you didn't use your keyboard with more than one device, would you still prefer the Logitech K780?
For someone planning to use a keyboard with multiple devices often, I wouldn't recommend the Apple Magic Keyboard. Right now, I've got both that (the smaller one, not full-size) and a Logitech MX Keys bluetooth-paired with my Mac Mini, so I can reach for either. I've been using the MX Keys a lot more, probably because it's newer and I paid the money, but when I stop and think about it, I can't say I like it better as a 'one device' keyboard. My thinking:
1.) The MX Keys has a subjectively greater resistance to typing. It's not hard to type on, but by comparison, the Apple Magic Keyboard has so little key travel and resistance to typing that my fingers seem to whip around it faster.
2.) The MX Keys is much heavier and noticeably bulkier.
3.) The AMK doesn't have the notable time to wake from sleep that the MX Keys does. I noticed this early on and it remains true; I can pick it up, start tapping a key, and it's about the 3rd or 4th tap when the character I'm typing appears onscreen.
4.) One thing of note: My Logitech MX Keys not only has backlighting, unlike the AMK, but the light shines through the letters on the keys (which is often not the case on mechanical keyboards with their default keys; my MX Keys isn't a mechanical keyboard, but some people like backlit keys with shine through keycaps, so if that's a 'thing' for you, so noted).
How does your K780 compare to the MX Keys on the points I mentioned (e.g.: weight, bulkiness, ease/resistance for typing, wakeup from sleep time, backlighting/shine-through-keys)?