I think the point of my post was the exact opposite, that it's extremely hard to do, and once you are both clinched up with grips, it's almost impossible to take down a good judo guy if you don't have similar or better judo skills.
On the other hand, the answer to your question is pretty obvious ... wrestling. The only times I have ever had success at taking down judo guys standing, it has been with straightforward wrestling, particularly with deep level changes and penetration shots ... duckunders, double legs, etc. Throwing and foot sweeps are basically impossible. And letting the other guy get his grips is a terrible idea. Once he gets grips, forget about doing anything.
I can only surmise that judo competitors will become increasingly vulnerable to wrestling, what with the recent rule changes. On the other hand, so many people are cross-training nowadays that maybe it all evens out.
In BJJ competitions I have participated in most people shoot for a single leg or double leg then a uchi mata or o soto gari. Though i competed only in white and blue belt. Maybe other belts there is more judo.
Guard pullers are everywhere even i was a big guard puller. That is why I worked on my takedowns and wrestling to competent in stand up. I just got tired of being one dimensional and not getting top position right away. Also after doing 4 to 5 fights guys start to pick up on your guard pulling.
I believe it is important to have at least 3 solid takedown moves. I also like Judo I find training the art beneficial to me as a martial artist.
Still when it comes to a BJJ or grappling match I find wrestling for me is better. Every body I fought stay very low to the ground. So it is hard to get a good lapel grip and I am not that good at judo that I can force it.