This is an opinion. I like Remington. Feels good, looks good and nearly impossible to beat for accuracy especiall the Mod 700. Some might not like the price and some will crtisise the Remington...
Neither: They both serve their own purpose. You would not use either one to do the others purpose. A sniper rifle is used to engage long range targets at a very low rate of fire, Commonly used to...
That depends entirely on the purpose for which you intend to use the rifle. Modern rimfire rifles are usually chambered for either .22" caliber cartridges (shorts, longs, long-rifles or magnums...