I like leather grips because they're firm and give me a lot of feedback. They tend to get slippery so I add an absorbent overgrip and I run through reels of Tournagrip like theres no tomorrow.
The problem with leather grips is you have to take care of them and allow them a breaking in period. They tend to shrink over time, but also get better feeling over time and last for the entire life of the racket unlike other overgrips that fall apart.
It will take practice to regrip a racket with a leather grip because you will probably not get it right the first time. The spacing is critical.