Of the three you listed, I'd pick the Savage Axis II over the others. I'd also choose it over the Howa/Vanguard rifle. (and I say this owning a Howa 1500 and being quite happy with it)
"More than one word answer" why: Savage only does rifles. Their reputation for quality and accuracy at a decent price point is pretty much unmatched. And the Savage Accu-Trigger is, in my opinion (my very novice rifle guy opinion...), the best low-buck trigger that any rifle has ever seen. It's not the best trigger ever, but it's -BY FAR- the best deal in a low-dollar setup for a trigger I've ever come across. And if you want to wring accuracy from a rifle, the trigger is, IMO, a pretty big part of that.
Savage over the Mossberg: the Mossberg rifles don't impress me in the slightest. They make a solid shotgun and I wouldn't be surprised if eventually... they just go back to doing what they do best.
Savage over the Marlin: Marlin's bread & butter is a well-done lever gun, Savage is a bolt action rifle maker. I haven't had the chance to play with a Marlin bolt action rifle, but it'd have to under-cut the Savage heavily in price before I'd ever consider it.
Savage over the Ruger: Ruger makes a nice array of products all across the board that incorporate decent serviceability at a working man's price, but SO many of their newer products have teething issues that almost seem like beta-testing by the buying public. Again, Savage is a bolt action rifle maker and I don't see them ever sitting behind Ruger in a bolt action rifle.
Savage over the Howa/Vanguard: this is going to be a far closer race, in my opinion, until you get to the price tag... and then it's just not going to be close. A Howa is a fine platform to build a rifle, but the package deal of the Savage Axis just seems to be unmatched in what you get for the outlay of cash. Of course, that's with regard to the Weatherby Vanguard. If you compare it directly to the Howa package as Legacy Sports offers them, now we've got a real race on our hands as the price is going to be much closer.
In the end, though, you're choosing between a flourishing American builder with a long history and an importer offering a Japanese rifle. I re-iterate, I have a Howa and I've been much impressed with it, but I bought a stripped down closeout rifle for low bucks and mounted my own optic to it, you're talking about purchasing a package deal that's ready to run.