Which of these two ways to rotate a model is the best way to rotate a model consistently?

I have 2 different ways that work pretty well. I'd like to know which is better, or if there is another that would be better than my current two... And why.

The first one I have used just takes rotates the model by using a while true do loop to set the CFrame

while true do
    wait(0.25)
    model:SetPrimaryPartCFrame(cframe * CFrame.Angles(0, math.rad(90), 0))
end

The second on uses a tween

local Info = TweenInfo.new(0.1, Enum.EasingStyle.Quad, Enum.EasingDirection.In, -1)
local tween = TweenService:Create(DummyValue, Info, {Value = cframe})
tween:Play()

They both do the same thing; I would just like to know which would be "better", I guess which would be more efficient than the other? If any lol. Thanks