If you are going during a very buy time, you may find it to be to your advantage to have both
Genie+ and the
DAS. Our experience is that during slower times, it's really not necessary to spend the extra money on Genie+ and that DAS is adequate on its own.
We were just there Sunday/Monday/Tuesday. We bought Genie+ for Sunday because it was the weekend and I figured it would be crowded with the new ride opening and the new nighttime shows. My husband has a muscle condition and arthritis and uses an ECV in the parks. We spent most of the day on Sunday just getting wheelchair return times and stacking those with the Genie+ times. It worked like a charm. We did have to wait for wheelchair return times on some rides, but the Genie+ return times were almost instant for everything but the big rides, so we could always find something nearby to ride while waiting for our return time window to open.
We got my husband a DAS Sunday evening because the
scooter just wasn't meeting his specific needs. We then just used the DAS Monday and Tuesday with no Genie+. The crowds were low enough that most of the return times were within 0-15 minutes all day. Only the super popular thrill rides had windows that were longer than that--but the standby lines of the nearby rides were short enough that we were able to ride something else (or have a snack or shop) while waiting for our return window. It was awesome, and honestly pretty much exactly the same as our experience with Genie+.
Genie+ would have added very little (if anything) to our days on Monday and Tuesday. And I would have been super annoyed that we spent $75 extra each day on it, lol.
BUT my husband, who has the DAS, wanted to ride everything. It's different if the DAS holder is a child who isn't tall enough or doesn't want to ride a thrill ride because I am pretty sure the DAS holder has to ride.
So, it might be worth one day of Genie+ for you and your husband to be able to ride the thrill rides if that's important to you. You could book a time and then use rider switch so you both can ride with minimal wait times. ALTERNATIVELY, you could each utilize the single rider line at rides like Incredicoaster and Matterhorn. Since you won't be able to ride those rides together with little ones, you might as well take advantage of the free single rider options and not pay for Genie+ if you don't have to. Not all of the thrill rides have single rider lines, though, so again, one day of Genie+ for the adults might be worth it if the priority for you all are the rides that don't have single rider.
Hope that helps!