I've never read LOTR. So I don't know about it.

In the list I've only read Dune and A Song of Ice and Fire. I liked them both but I voted for ASOIAF, mainly because the series keep on being good, unlike Dune, which in my opinion went downhill after the second one.

Different story if we are comparing ASOIAF and Dune alone. I think Dune is better. The philosophy and wisdom behind Dune is just amazing.

But I like Ender's Game the most, putting aside the author's weird political view. It's for kids but it really made me think.