I own both so I feel I have some knowledge to share. The Vanguard as already stated is made by Howa of ***an to Weatherby specifications. The Vanguard will be heavier than the T3. The actions are a bit different if that matters to you. Both rifles come with an accuracy guarantee. The Tikka does have more plastic components than the Vanguard but with reasonable care both rifles will last you a lifetime.

The main criteria for purchasing the rifle is to handle each and see how they naturally feel to you. I can say hands down the Tikka just fits me better than the Vanguard. One thing though is if you're new to rifles the light weight of the Tikka allows it to recoil stoutly when firing 180 gr. loads with the 30-06. The Vanguard has less felt recoil as rifle weight will help lessen the blow. This is something you might think about. Both are good rifles and worth buying. Choose the one that fits the best and you will do just fine!