The basics for takedowns are the same for any grappling art. The takedowns in BJJ are solid. However they are better in other arts like wrestling. This is because that is all wrestlers do ( not sub wrestling). It is like if you really want to learn how to box then take boxing.
If your goal is to fight in MMA then I would do both wrestling and BJJ. If you are only in BJJ then BJJ takdowns are good enough.
In the street you would not really want to go to the ground. If you had to then aganist your average street fighter a BJJ guy can take him down.
I do both wrestling and BJJ. What I notice is that about two years of highschool wrestling is = to a BJJ balckbelt's takedown skills. Just like a blue belt in BJJ is = to a Judo blackbelt's submission skills. These are only estimations of what I noticed. It depends a lot on your school and instructor as well.
The single leg is my favorite takedown.
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