LoTR is like Skyrim, while GoT is like Dark Souls
LoTR is long, entertaining and magical, but IMO lukewarm - it's a good watch and a bit like playing Skyrim, where you can just get into it for a few hours and zone / chill out to a pleasant vibe.
GoT is dark, INTENSE, full of unforgettable characters and way more engaging, with a menacing universe which is shocking, brutal and ruthless - to me it's like Dark Souls, which you can never play with the same nonchalance and casual style of Skyrim.
And yes, I like LoTR and Skyrim, but I LOVE GoT and DS way more ;)