If you're going to be walking/hunting with it, go for the 20". If purely stand hunting or stationary position, you can go with the 26" if you like it better. Velocity loss due to the shorter barrel is negligible and will not have a discernable impact on most shooter's performance. The 20" barrel, being shorter and thus stiffer may offer a little better accuracy potential, all other things being equal. I own both 20", 24" and 26" Remington 700 VS, LTRs and Customs in a range of calibers, including .308, .223, .22-250 & 7mm Rem Mag. For standard calibers, the 20" is my choice for varmint hunting. My brother uses his LTR in .308 for moose hunting.