I'd agree that cats have different attitudes to outside.
Maddy is a little homebody and goes out for a bit every day and sometimes to toilet but mainly stays indoors. The only time she seems to really enjoy being out is if I am with her. If it is too cold or rainy then she just stays indoors through choice.
Paddy spends the longest outside and doesn't like using a litter tray, so always has about 30-40 minutes outside before bedtime as well as a couple of hours during the day and much longer in the summer. He is also the only one who catches mice & birds.
Freddy is somewhere inbetween and loves going outdoors for little periods but never goes far and never stays out for long. If he goes out the same time as Paddy then he follows Pads around outdoors (like an annoying little brother

). He also steals any mice or birds that Paddy catches and takes over the torture

My cats all stay in at night and although I sometimes have to stay up late waiting for Paddy to come home, I always wait before going to bed as Freddy can somehow open the catflap even when it is on in-only. So say from 11pm (or 2am if Pads takes his time) they are indoors and then Paddy wakes me between 5-6am (with his special "I want a wee" miow) when I open the catflap and go back to bed. When I wake up next they are all inside so I think they just go for a wee and then wait for me to get up and give them brekkie. Even though letting them out when it is still dark in the early hours may seem counter-productive, I do this because my main reasons for keeping them in at night are because of gangs hanging around (which they do most nights until about 2am) and they are gone by then.
I think that the 2 boys would be very reluctant to be indoors because they have tasted the freedom of outside, but if they had never known it then I'm sure they would be fine. The boys are vocal during the day and the night too
