I honestly can give no comment on the Vangard other then the reputation of the Weatherby name. AS for the Tikka I can tell you that you probably won't find a slicker action then the T3's unless you upgrade to a Sako (same family). As for them having more 'plastic' components - not true. The magazine is a polymer that is much stronger than a sheetmetal magazine. You will also find that the trigger on the Tikka is superb. It will break cleanly with no creep or overtravel. Probably one of the better production rifle triggers out there.
The T3 as previously mentioned is lighter and will give you more felt recoil. But that will only be noticed on the bench and not during huntng. But the lighter weight will be a pleasure to carry.
The old 30-06 is tough to beat as a one rifleman's chambering. There are countless other cartridges that are better suited to specific tasks but the old '06 is extremely versitile.
But the best advice to your choice of rifles is, as stated in an earlier post, to handle them both and see which one feels better to you. If it feels good to you - you will shoot it better.