Potsdam / Sanssouci Palace was beautiful and we were lucky with the weather - blue sky without a tint of clouds.
The palace grounds are expansive and as we have read elsewhere, the grounds are more impressive than the palace itself. We got there around 1030 and the earliest time slot we can get for the palace room tour is 1250. It’s really annoying that you have to plan your day around the those times entries so I would suggest just skipping it. We bought the combo ticket but in hindsight, we should have not bought any tickets. The Sanssouci Palace is really small so the tour was completely skippable. Instead we had to plan our route around the timed entry and there were really very little time to cover such vast grounds. The new palace is actually bigger and more grand looking than Sanssouci Palace so maybe we should have done the inside tour there. There is no wait to enter the new palace although you have to go get a timed ticket too if you have bought a combo ticket. We also entered Orangerie Palace and climbed its tower ... nothing spectacular so skippable too.
We used Berlin Welcome Card to take the 695 bus which acted like the drop on and drop off shuttles for us between the palaces. It’s not a stroller-friendly place - lots of stairs here and there and the roads are usually not paved.