Which gun is best? For what purpose? Hunting of big game (how big), varmint hunting, target shooting, etc. What features are you looking for? Where will you be hunting, terrain, etc. Tough question.
All of the major manufacturers make good rifles. Some here will condemn one model or another based mostly on personal prejudices, likes/dislikes, and/or a bad experience with one or another gun.
Given your limit of $700 you should have no problem purchasing a quality firearm.
Rifles by Remington, Ruger, Savage, Winchester, etc., they're all pretty good. It really just depends on what you're looking for in the way of features, chambering, etc. Do you
want push feed, controlled round feeding, two position safeties or three way, wood stock or synthetic, blued or stainless barrels/actions, blind mag., hinged floorplates, or detachable mags., adjustable triggers, etc., etc.?
Winchester makes a good rifle. I particularly like the Featherweight Stainless model.
I don't like synthetic stocks, but then that's just my personal bent.
Remington has a couple of models I like such as the model 700LSS Mountain rifle.
Rugers are one of the best for the money, but need trigger work.
Savage makes some of the most accurate (out of the box) rifles around.
It's a heck of a market out there - lots of variety, and very competitive. Something for
everyone. And yes, can be confusing.
Take your time in deciding what you want, what you need, and whatever you do, pick a rifle that fits you, that feels right to you.
And, be sure to also allow enough $$$ for a good quality scope.