Am I the only one that thinks old Katarina is better?

yes you are the only one.

old kat was broken as fuck lmao which is why they reworked her, she's still really strong just takes little more of a brain to use her to her full potential.

Old Kat was stronger in late game teamfights than this one because her way of resetting and doing damage was more reliable/quicker.

This Kat is way stronger in lane, so her early/midgame is much stronger than the old one.

If you meant better as in more fun, they each have their own things that I really like. I cant really choose one

Well, "better" is relative. I know the rest of that statement is "better than the rework," but what aspects of the rework exactly do you find inferior? I miss hitting more targets with Q in lane, and being able to shunpo to wards. But I feel that they more than made up for losing those aspects of the kit. There are few things more satisfying in this game, in my opinion, than the new sound effect on Kat's Q as it hits each target and lands. Every part of her gameplay is more satisfying. It was a bit easier before, but not by much. Now you need to keep track of the daggers on the ground, but it's super fun to play, for me. If you go in and W right before you ult, you also throw a dagger while ulting, dealing the extra damage and getting another Shunpo ready to pursue as soon as your target(s) leaves ult range. Great rework.

I mean I preferred the old kat because of the late game team fights and how the only thing holding back the player was their reflexes and their quick decision making but new one is definitely stronger though just because of how easy it is to snowball early on so you need to clarify what you mean by better