Depends on the children, their ages and their state at that point.
For mine, when small, dd1 was easiest when out. She loved to sit in the buggy and watch the world go by.
Dd2 was not. She hated the buggy so she either wanted to walk or to be carried. In fact with the pair of them we more often ended up with dd1 in the buggy and dd2 on the buggy board or walking - from when she first walked at 8 months. However when she got tired, and she went from 0-60 in about 3 seconds, she was awful. Didn't want to go in the buggy (she actually snapped one buggy throwing herself backwards in it with a strop) but didn't want to walk, or be carried... So actually she was easier to handle at home.
Ds a mixture. If it interested him, and wasn't too noisy (unless it was aeroplanes) he was easy when out. Mostly. However it was hard to find something that interested him enough and also interested the girls who were quite a bit older. However he preferred to be home (still does as a young adult) and was much happier pottering around, preferably naked, at home. He doesn't do the naked any more, although minimum clothes is a good description.
But they all had their moments. I remember well the time when dd1 aged about 12 announced she would rather throw herself out of the car and die than go to whatever it was we were going to. No it wasn't outrageous. We can (and have done) laugh about that now.
There were trips we went on that I discovered when there, having gone by public transport, that one, normally ds, was ill and was just miserable.
Although the two hour train journey where I discovered as we got off the train in the middle of nowhere, with no return train until a good deal later that dd2 had a temperature over 41 was perhaps more memorable.
She was less bothered than me tbf. She did spike these temperatures and seemed totally fine with them. Trying to get her to stay still, take the calpol and rest was a challenge when there were such fun trees to climb. At least it wasn't in the sun, I suppose.
As they got older, I think they all more appreciated time at home, even dd2, though. They liked their days out, but at the same time they also liked their days at home, and wouldn't have wanted to be taken out every day.
Our most successful days were our board game days. I'd buy a load of snacks and do some popcorn, and we'd start with our version of monopoly (we had a set length of time), move on to some card games, play a couple more board games then finish watching a DVD in front of the computer (no TV) with finger food dinner. Sometimes we'd have a break in the garden for half an hour, but not always.
They loved that from as soon as they were old enough to do it until they left home.
And I'd say that any two was easier than taking all three. And any one was easier than taking any two.