The original movie is superior to its two sequels by far. Secret of the Ooze was sillier but still had a solid feel to it. Turtles in Time, I was older and didn't care as much, and it's just not a great movie.
I haven't even seen the new ones because I wasn't going to pay to go see them and haven't found them for free or on any streaming services I use.
Do yourself a favor. Don't bother.