I'll start by saying that nWo main theme has gotta be the GOAT or very close to it. Never gets old. Also for old school, i also really liked Mr. Perfects theme. Hell, i even kinda liked Mr. Perfect mixed with Ryback during the Rybaxel tag team, lol. The Demolition theme was great.
Some songs I thought were good with no vocals, but then they felt the need to add vocals, like Batista's before they added Saliva. I also like HHH's pre-vocals version of "its my time now" from 99-2000 ish. Another no vocals one I like is the Bludgeon brothers one. Cactus Jacks WWF theme (funny note, that was used in a Porn), and several years ago on ESPNs "baseball tonight', they actually occasionally used the Hardys theme for some game highlights. Like Samoa Joes, Lars sullivans, Nakamura both old and new.
Edge's last theme i really liked, loved Dolph Ziggler's "I am perfection", which they should've never got rid of. Ditto for Zach Ryders "Oh radio". Drew Mcintyre's "Broken Dreams" was great, but understand why they no longer use it as it doesn't fit his character anymore.
Even though ECW just used non-wrestling themes unlicensed, "Enter Sandman" for the Sandman was epic, as was Tommy Dreamer using "man in the box". Sabu's theme was great too, which might actually not be stolen

Liked Goldbergs WCW one. have no idea why WWE modified it during his 1st run there, but glad they bought back the original last year.
The worst ever in my book, the big shows. its probably not even close. Ciampa's new NXT music ain't bad, but i liked it way better when they had him coming out to no music. It just fit his character perfectly.
Whats your guys picks?