I have loved every A Bolt and X Bolt I've ever shot. They shoulder quick, are easy to get on target, don't seem to be picky about what type of loads you shoot down them, have an excellent bolt throw, have a great "factory" trigger, easy to use magazine system, and for really light guns they flat out shoot!
However these things don't necessarily make them the most desirable dedicated long range rig. Although my X Bolt has shot it's fair share of .5 MOA groups it takes a lot of concentration to keep that light of a rifle right on target due to it's lack of weight. Groups also open up during extended shooting sessions because the barrel is just too thin to handle lots of rounds in a short period of time.
The Remingtons are so popular to build off of because they are so easy to work on for most smiths and they're cheaper guns to begin with. The Savages are really awesome rifles too. However, it always makes me laugh when people talk about how well their Remingtons shoot but when I look at them they've added an aftermarket stock, a new barrel, a new trigger, paid to have the action tuned up and I can still outshoot lots of them with my stock Browning.
I'm not dissing any other gun manufacturer. I have a Remington 700 VLS that shoots freaking awesome and it's bone stock other than a cheap bedding and trigger job. I've seen some Tikka's and Weatherby's that shoot a hell of a lot better than they should for how cheap you can pick them up for; and Savage never ceases to amaze me at how they can be the ugliest **** guns you've ever laid eyes on and then shoot little bug hole groups on the range all day long.
One day I hope to have enough money to build a dedicated long range rig (probably off a savage action cause the wife probably won't let me go full up custom) but until then I'll stick with my Brownings. For those people who don't like them they should try one, they are a whole lot of gun for the money.
The best thing to remember though is that all the different manufacturers make this whole thing so fun. It lets everybody kind of do their own thing as we all have a great time doing what we love best.... throwing lots of lead downrange.