Exactly which trigger you get along with many other features depends on when the rifle was made and who it was made for. Howa has made rifles for many years and sold them under several names. But the rifles have evolved over the years. And the ones made for Weatherby have had different specs in some cases compared to the ones sold as Howa. Most of the time the ones sold under the Howa name have appealed to me more than their Weatherby cousins.
The action is the same. But there have been different triggers, safeties, stocks, bolts, and barrels. At one time Howa offered 3 position safety while the Vanguard version had a 2 position safety. I think they are all 3 position now. Weatherby had a fluted bolt at one time while Howa was plain and Weatherby used to sell all of them with 24" barrels while Howa sold the same rifle, in the same cartridge with a 22" barrel.
The Vanguard/Howa is a very good rifle. It borrows heavily from the Remington 700 design, but corrects all of the shortcomings of the 700. It has a better trigger, better extractor, and the bolt handles are attached so they won't fall off like the 700's will. In most cases they use the same scope mounts as Remington. The only difference is if you want to use a 1 piece base on a short action then they are different.
Where they differ from the 700 is that all things being equal the actions are 1/2 to 3/4 lb heavier. That combined with the heavier stocks they tend to put on them makes for a pretty heavy rifle. A Winchester FWT will be at least a full pound lighter than a Vanguard.
And by modern standards a Winchester FWT isn't that light. You can buy rifles approaching 3 lbs trimmer than the Vanguard.