(I copied this from a discussion forum but can't remember which forum or who the author was, so take from it what you will.)
Rem 700 & Win 70
The Remington 700 has a 3 piece, soldered together bolt (including the bolt handle, it's soldered to the bolt body versus pressed splines for the Winchester), the Remington has a questionable 2 position safety to the Winchester's 3 position (Fire, Safe but able to work bolt, Safe bolt locked), which is likely the best in the business and copied by $20,000 a rifle custom makers more than any other safety as well. You can get top makers to build you a $10,000 rifle on a Model 70, when nearly none of them will put their name on a Rem 700 project. Read from this what you will. The Winchester also has an actual recoil lug, and an action made without the manufacturing shortcuts of the Remington. The Remington 700 receiver is pipe, with what I feel is a homely arrangement of a sandwiched recoil lug between the receiver and barrel, versus Winchester's integral to the action lug. Finally, the Model 70 is controlled round feed, with a Mauser-style claw extractor, versus the Remington's push feed, and "paperclip" extractor.
To play devil's advocate, benefits of the Model 700 is a minutely faster lock time, irrelevant to 99.9% of hunting likely, factory detachable mags if you prefer that, and it is extremely easy for gunsmiths to work on and tune, for instance the entire receiver being round as a manufacturing shortcut is easily chucked into a lathe and trued. The Rem 700 is a decent agglomeration of shortcuts to summarize.
I came to my heavy favouritism for Rugers and Winchester after building all my custom rifles on Rem Model 700's, when I first started I was a big fan of them. Time and some issues changed that, now you can't pry my Rugers and Winchesters away, they're just better built hunting rifles. There are some serious quality control issues to bear in mind with late model Remingons as well.