As you will find reading many posts here from physicians and patients, and from a visit to a good surgeon, the hip resurfacing is far and away the superior solution for those who are active, and wish to remain so after the surgery (versus hip replacement for example).
If a Dr is saying you can't be as active again afterwards, the physician seems uninformed in my opinion. Read lots of posts here and you'll see what I mean.
I've learned
1) HR conserves the most bone
2) Stress and loading after HR is most closely aligned to your natural loading on a normal hip because the size and shape of the resurfaced ball and socket are as similar as possible to what you had before, and the biomechanics of the upper femur are mostly preserved.
3) A replacement drastically changess the geometry of your hip, and loads are placed elsewhere and bone growth stops in the areas where it would occur naturally; the ball is much smaller, and many are metal on plastic and often wear out relatively fast
Hope it helps