Getting scope for big game hunting rifle (300WinMag), spot and stalk mountain game rifle (elk, mule deer, sheep, goats). 3-15 power range.Which system better for hunting use . Speed of use? Ease of use (time to use, ability to use with cold, wet hands).I've looked through comparable price/power range scopes and am aware of glass difference between brands. I have used a Swarovski scope (old model FFP TDS reticle) for years.Opinions of those who have used these scopes in backpack or horseback hunts would be greatly appreciated.