The best fights in a novel for me were in Heavenly Jewel Change. I'm usually very picky about fighting scenes and see a lot of them as filler, but in this novel I was always looking forward to almost every single fight, because it has maybe the best battle/cultivation system I've ever read. There are also a lot of unique ideas and strategies involved in the fights.
I like the fights into The Legendary Mechanic, they're well described, so I can create a picture of it in my mind Demon Hunter is another one with great GREAT fights
You're welcome~~~~ I have remembered about The Dark King as well, another good one, even if the novels' focus isn't all about it
Not sure what your definition of great fights but here are some novels that I know with fights that I think are exciting: Talisman Emperor Lord Xue Ying Sovereign of the Three Realms It more scheming but there are fights: Genius Doctor: Black Belly Miss This is BL but Vanguard of the Eternal Night
Novels by TJSS author of Heavenly Jewel Change Renegade Immortal Legend of Great Saint Lord of Mysteries