Given the 3 choices, the EFR is at the top of the list. You can't beat that one. If you have a choice of the 3 and don't mind the price, get the EFR. I have one, and a Simmons 4x32. The EFR is on an R-10, and so far has held up well. Good optics, bright picture, overall an excellent choice.
The Simmons 4x32 is a very small scope and fits well proportionally on a small gun. It should hold up well on the R-7 also. Optics are pretty good, sight picture is good, a little blurry around the edges though. Theres a version of the Simmons 4x32AO that has sort of a mildot reticle too, its sold as a crossbow scope. Sportsmans Guide has them on sale.