I`ve used the Harris bi-pods, swivel, for years, the short for prone, long for sitting. Lot of the choice would depend on the country your hunting in, and only you know that. I`ve also found that if I mount the long, sitting, bi-pod, I can react quickly to shot chances by extending the bottom legs when carrying my rifle. I also found them light, so can pack either or both, with no problem. What ever you buy, practice with setting it up quickly. I dry fire with all mine, in particular the 12 - 27 inch sitting. Longest shot with it has been to 465 yrds.
Good Luck
