I like both...but Lord of the rings has never captivated me to the extent Potter has.
I have probably read each of the Harry Potter books at least 6 times...and the first three in the series prob a minimum of ten. lol every time a new book would come out, I would re-read each previous one before opening the new one, by the time the seventh one came out, oh god I could recite some scenes word for word.
Plus the Harry Potter series have been the only books that I have been completely satisfied with...it ended in a way that completely and wholeheartedly catered to my mind that if I had a chance to change things...I wouldn't. It ended perfectly.
RIP poor Dobby...his death struck me the hardest of all the characters. And I was completely shocked by Fred Weasly's death...I cried for George...ahh!