I'm a fan of both of these models. The Ruger was always cheaper, not quite so much now with the Gen2 version. I've had several, mostly Gen1 models, and they always shoot accurately, have decent triggers that are easily adjustable, and generally work well. The design of the Ruger demands that when you have the factory model that uses AICS magazines, or decide to mod your existing gun by swapping it into a stock or chassis that accepts those mags, you find that the location of the stock bolt directly in front of the trigger interferes with the magazine-release mechanism. This results in it being a PITA if you want to remove the stock for any reason, or even just need to check the torque on the stock bolts. Ruger actually makes a goofy little tool to ease this task, and after a bit of practice you learn to do it fairly well even without the tool if you use a slave pin. But it is an irritation that never really goes away.
The Tikka is a bit more money, maybe not quite as good a value in terms of performance per dollar spent, but it also doesn't "feel" nearly as cheap, IMHO, as the Ruger. I think it's quite a bit nicer for a bit more money. Still a budget gun, but not a toy-like on-sale-at-Walmart feeling one.
Honestly, now that Ruger has re-branded the original Gen1 Americans as the Glenfield line, I think they represent the best value amongst these guns. Gen1 Americans have always shot just as well as Gen2 versions for me. You don't get the stock-length adjustment, you don't get the fluted barrel (thankfully!) and you don't get Cerakote. If that stuff matters to you, go for the Gen2. If, like me, you find those features less necessary, the Glenfield is a value champion.