The LoTR soundtrack is one of my favorites of all time, but I could never call it the best.
ᴴᵒʷᵃʳᵈ ˢʰᵒʳᵉ ᶦˢ ᵃ ᵍᵒᵈ⋅
ᶜᵒᶰᶜᵉʳᶰᶦᶰᵍ ᴴᵒᵇᵇᶦᵗˢ ᶦˢ ᵒᶰᵉ ᵒᶠ ᵗʰᵉ ᵍʳᵉᵃᵗᵉˢᵗ ˢᵒᶰᵍˢ ᵒᶠ ᵃᶫᶫ ᵗᶦᵐᵉ⋅
ᵀʰᵉ ᶠᵉᶫᶫᵒʷˢʰᶦᵖ ᴿᵉᵘᶰᶦᵗᵉᵈ ᶦˢ ᵃᶫˢᵒ ᶦᶰˢᵃᶰᵉᶫʸ ᵍᵒᵒᵈ⋅
Edit: I've changed my vote to LoTR since it has the most memorable soundtrack out of all of the movies I've ever seen.