Need help to check which width is greater

[Suilixua]

Basically I have a resource bar in WeakAuras and above is my primary dynamic group and below the resource Bar I got a secondary dynamic group.
I want that the resource Bar adjust the size depending on which of those 2 grps has a bigger width overall.

I tried it with

WeakAuras.regions[aura_env.id].region:SetFrameLevel(1)

if(not ProgressBarHooked)then
    local upEnv = aura_env;
    local function setWidthHook(self,width)
        upEnv.region:SetRegionWidth(width);
    end
    
    local topGroupRegion = WeakAuras.GetRegion("Demon Hunter » Primary Bar");
    local bottomGroupRegion = WeakAuras.GetRegion("Demon Hunter » Secondary Bar");
    
    topGroupRegionParent = topGroupRegion:GetParent();
    bottomGroupRegionParent = bottomGroupRegion:GetParent();
    
    
    if topGroupRegionParent:GetWidth() > bottomGroupRegionParent:GetWidth() then
        hooksecurefunc(topGroupRegion,"SetWidth",setWidthHook);
    else
        hooksecurefunc(bottomGroupRegion,"SetWidth",setWidthHook);
        ProgressBarHooked = true;
    end
end

Somehow it only uses the width of the secondary bar, eventhough the primary bar has a larger width.

If I change at the bottom the <"bottomGroupRegion, "SetWidth"> etc. with "topGroupRegion" it only adjusts to the primary bar.

So I guess I miss some small detail and would appreciate help.

https://medal.tv/clips/L0yaUaqwofV76...MTQ5MjMyNDM0LA - here u can see the problem in action