Both games are about neck and neck but here I'll say TWW just because. Both were particularly easy titles, and the only challenge (for me) was building up motivation to 100% each title -- you know, since both have MASSIVE overworlds that are super ultra tedious to travel lol. Besides the odd moment when I got stuck in TWW (Jalhalla woo! Deku Tree Woo!), I don't think the game was particularly hard. And TP, hidden skills made the game easy and have that flair, but even if you restrict yourself to minimalist, the game doesn't act hard thanks to auto-shielding. So idk, difficulty isn't a factor.
I felt TWW was largely the bigger game, talking game world size. The dungeons also felt bigger, and I like that. I prefer Epona to boat-travel, but the KoRL was more relevant to the game as a whole than Epona was. And the characters in TWW were all side characters serving just a side character role; in TP there were a bunch of side characters (Ilia is the prime example) who were SUPPOSED to be side characters but tried to jump into main character position and just weren't pulled off the greatest.
TWW winsfor me.