Hey, Kavita,
I see you need something super light, based on your choices, and you also say it should be compact. I don't totally get why the Bugaboo Cam 3 is in the choices, though, even if nicely light (and quite cool looking), this is a bulky stroller that takes a lot of space of a car trunk. So I would say if that is a priority, that option is not totally for you.
Leona vs. Eezy S-Twist-wise, I personally think the S-Twist is a bit better, but they are very similar ad quite comparable. Though the push of the Eezy is a little nicer in my opinion, and the seat, even if both are narrow, is overall a little roomier feeling. So I wold probably go for that one.
That being said, I feel like that is more of a really compact, simplified option for people that really struggle with space and need something super small while reversible. I think you may miss a little more fullfeatured feel, which is why I would also suggest the Cybex Mios. Even if pre-owned (if the budget would not be enough for a new one), this is one very small, very nimble, but not a simple stroller, and I think that would be the best option for what you're describing.