You're not going to throw a bigger AND stronger opponent with any Judo technique, unless you're significantly more skilled at it than your opponent.
Double/single legs etc... can work because you're relying on their lack of balance/athleticism to fill in the gaps for your lack of technique with a double/ single. Assuming you're not a high level wrestler, because if you were you wouldn't be asking the question, as you'd already know you were technically good enough to pull off the technique on someone bigger and stronger.
In reality, there's no silver bullet.
If you want to consistently throw people bigger and stronger than you, get better technically, any other answers are sticking plasters or rely on a lack of skill of the bigger/ stronger person.
Think about it this way, there's no one technique you can learn that will allow you to throw Brock Lesnar, it just isn't going to happen, unless you get to a level where you're comparably strong/big or so technically superior that it doesn't matter what the technique is, you can throw him with whatever.