I would say that overall the floor and programming are more limited, but it’s a good complement to presentations at other cons if you’re a fan of the Disney properties. Standby for the popular panels could be difficult, my friends got in the unofficial line at 2am Saturday and the last people to get in standby were the two people behind them. The Lucas and Marvel segments though were on par with SDCC.
Also, if you got the D23 Hall preferred seating badge (which granted, was $900), meant you could sit in one of the prime front center rows and sleep. I took advantage of it and got to sit in the front row for the Lucas/Marvel panel, and doing that at SDCC would be impossible.