Honestly, I won't really argue about the story because I think it's subjective. I'm more interested by "Sci-fi" than "medieval fantasy" in general, so I prefer Cyberpunk (story and characters), and by far... On side note, Cyberpunk won a Steam Award for its "Outstanding story", so I assume, about the story at least, most of players enjoyed it. On side note, if I compare the achievements on TW3 and Cyberpunk, there are twice as many players who have finished the main story of Cyberpunk, even if the game is 5 years younger.
Also, it's just a guess, but I think that generally players prefer medieval fantasy rather than sci-fi/post apocalyptic. Which could explain why The Elder Scroll always sold more copies than fallout. Knowing that Bethesda games are very similar. So "interesting/epic" story is quite subjective... For example, for me, Mass Effect have the most epic story ever... but I guess you don't share my statement
Ok, I agree that TW3 offer more "little" choices, but those which really influence the main story are quite limited (for the endings, only few dialogues and decisions change the ending you will have...).
But I'm surprised by some of your points and I disagree, really > Level scalling and skill trees...
I don't know how it can be "better" in TW3, knowing that Cyberpunk offer way more possibilities of builds. Then in both games, perks mostly add % in the exact same way... I means in Cyberpunk, you can go for a street browler with Gorilla arms or a baseball bat (blunt melee), full netrunner, solo with shotgun/HMG, stealth with guns or knives, ninja with katanas or mantis blades, and so on... (The list of builds on Cyberpunk could bit quite long, while in TW3, the list is quite short...)
You know, the title of this thread is encouraging subjective opinions

so they are not a problem to me, I like to hear different takes too, but if you're going to challenge mine opinions you better have a valid argument to challenge them with.
First of all, the number of players who completed the story is irrelevant. It's like saying that Renault Clio is a better car than Ferrari because more people used it. The Witcher 3 main story alone is at least 2 maybe even 3 times longer than that of Cyberpunk 2077.
And that's just main story, where are all the side activities. It also doesn't help that side activities in the Witcher 3 blow out of the water everything Cyberpunk has to offer. Those side quests in The Witcher 3 often feel like main quests due to their quality. Cyberpunk have few of those too, but they are few and far between. Even the busy work in The Witcher 3, those questionmark icons littered through the map are more interesting than NCPD scanner missions, because you'll never know what you'll find. Is it a monster, a bandit camp, a place of power, a hidden treasure? In CP, you know it's always a gang and it becomes boring, very soon. I only use these mission to level up fast.
Bottom line is, TW3 requires much more time and dedication to complete, so the sheer number of players who completed the game is irrelevant in my book.
As for the setting, sci-fi over fantasy, that is also irrelevant, because I can't stress enough that I'm trying to talk about the structure, not substance. Unless of course I'm asked directly to talk about it like it was the case with that one person on previous page where I couldn't explain to him (or her) in this worldly language that I understand and know all outcomes of one particular quest, which now leads me to builds, where your remark could be valid at first, but fail flat when you think about it. Geralt is a well established character, that's why I said TW3 is not the RPG in it's traditional definition. It makes 0 sense for him to be sneaky thief, archer, assassin, or fist punching brawler, or whatever your favorite build could encompass. He is a witcher, with two swords, signs and alchemical knowledge, and that's exactly what you'll get. V, on the other hand, is an unknown quantity and hence more build options are presented, but that is a substance again, not the structure.
You see, in The Witcher 3 you can only use 12 (16 with expansion) skills at the same time. You need to be very careful what you're going to chose as it will significantly impact how you play the game especially on harder difficulties. In my opinion, one only have to play on death march or very hard for builds in CDPR games to make some sense. In any case, your "skills" in TW3 are limited to 12/16 active ones at any given time, and they will either allow Geralt to spin around with sword, drink more potions, have different effect for signs, although arguably there are few of them that are mere % changes too. What you get in Cyberpunk is literally hundreds of active "perks" by the time you finish the game, which sometimes exclude one another or make you so OP that you can easily have over 100% increase in some areas which is silly and game breaking, and sometimes not even working. To this late date, I have the perk which would grant me the 100% chance to get the quickhack from a datamine, but I've yet to get any

Also, in the initial version of Cyberpunk there were some perks that you could invest the perk points in to, but they were impossible to execute because there were no game mechanics implemented to support them. That is removed now, but it just shows how silly the entire perk system is and how little thought is put behind the skill trees of CP.
I hope you can see the structure, over substance.