I'm late, but here's the pros and cons:
3 days of this month I've stayed the full 16 hours of the day - our family arrived at about 6:15 AM outside bag check, rope dropped rise each day, and we left after midnight. No breaks. Yes, we are crazy. Point is, I've experienced both in the same day multiple times recently.
Rope Drop:
Pros:
- Every ride will be empty at the start of the day.
Every ride, not just some.
- Rise of the resistance is actually open. And it probably won't break down because it just came off of a whole night of maintinence.
- There is a longer window once the park opens of short lines. Probably about 1 hour of
significantly shorter lines than the rest of the day, then another hour of moderately shorter lines. Night time will give you an hour and some change of actually short lines.
- Once you get past rope drop, the park is very open and everyone has lots of energy.
Cons:
- You end up spending 1 hour or so not actually doing anything but waiting before the rope drops at all. If time out of bed is a problem, this might lead to grumpy campers.
- Up Early
- Rope drop isn't pleasant - lots of crowds all feeling rushed to get to the first thing.
Night (Meaning 10:45 PM - 12:00 at
Disneyland - Anything earlier doesn't make much of a difference honestly. Lines at DCA only die down a little bit towards the end of the night, if at all for the big rides.)
Pros
- Disneyland at night. Need I say more?
- The lines are very short. Some major rides like Indiana Jones and Smuggler's Run are completely empty for the last 90 minutes of the day a lot of the time.
- Many rides are much better at night! Roller coasters speed up as the day gets longer because the oil in the wheel bearings heats up. Outdoor rides take on a whole new character at night. (Matterhorn at night is a whole different experience!). And getting soaked on splash mountain is much more...
memorable.
Cons:
- Parades and Shows can be a huge nuisance to navigate around at night. The walkways get all crowded AND some walkways close entirely which makes getting around complicated.
- Not every ride is empty (or open!). Rise closes at 9 PM. Space mountain never empties out - it usually holds on to an hour or so line all the way until midnight. Most everything else is basically a walk on by about 11:30 though. Everything but the biggest E ticket rides and like Peter Pan are walk-ons(ish) from 11:00 onward.
- If you have young kids in your group that can get tired, by 11:30 many people are ready to go home. That's why the park empties out so much in the last 30-45 minutes of the day.
For your group, if getting up early is that big of a deal, do Rise of the Resistance via rope drop one time and leave it at that. Night times will still get you short lines on pretty much everything, and if you're getting
Genie+, you wouldn't want to start booking lightning lanes until about 2 hours into the day anyway because they don't really get booked much until about 9:45 AM and the lines are so short before 10 AM that using them is kind of a waste. Especially on the Disneyland Park Side, even if you don't start booking LLs until like 4 or 5 PM, you'll still be able to ride everything. If you're park hopping, start by 10:30 or 11 and you should still be able to work your way through most of the rides on Genie+ in a day using a smart order of reservations.
Hopefully I wrote this in time for you to see it before you drag everyone out of bed every day

Have a great trip! Rope drop isn't worth it if everybody hates the morning lol.