I love all four Turtles, they're all great characters in their own right and work well as a group, but if I had to rank them, my ranking in the past would have looked like this:

Leonardo

Raphael

Donatello

Michelangelo

However, as I grew up the line between Leo and Raph started blurring and at this point I'm not sure which one of the two is my favorite anymore haha.

Btw, while I like the characterization in the 2003 series the most and it's the first iteration that comes to mind when I think of the Ninja Turtles, this is still true for basically every old iteration, up until the 2012 TV series and IDW comics. I didn't really like the Bayverse iteration much so idk. Rise was only okay to me, the characterization was different and I wasn't a huge fan of it (just that I didn't find any of those Turtles particularly relatable or likeable; idk which one was my favorite... could still be Leo for the fun factor?). I didn't really like Mutant Mayhem so I never even tried TotTMNT, it's hard to say - Raph might have been my favorite in that movie but I honestly can't remember very well.

Anyways, yeah, generally speaking I like Raph a lot, he's cool. Thanks for the ask!