I use czerny but practice hanon at my house... It's very useful I think!!! sometime I get bore of it... But I try to play with your own improvisationI don't know about this, but I practice to improving my fingers strength with thrills and scales... I often play thrills (in a score) with the wrong finger, but sometimes I think it's very useful...(sorry I'm just a beginner and dunno much about piano, I hope this can help, sorry for the bad grammar. Thx)
Finger strength has nothing to do with playing the piano.If you insist on strengthening your fingers, you'll only end up being an even lousier pianist with Hanon exercises to prove it.Playing the piano is the easiest thing in the world like writing or riding a bike. But if you think you'll become a better pianist by strengthening your fingers, I'll give you one advice:The road to hell is straight down.
Czerny or Hanon won't make your fingers strong.Finger strength is a misnomer. What you want as a pianist is an absolutely control over the activation of the mechanism that moves the fingers, the hand, the wrist and the arm.In other words you learn to control contraction and release of muscles on command.This is known as finger conditioning (which is what you're really after) and is not determined by strenght. Strong muscles are not more coordination or easier to activate and release.What I mean is that there's no set of market gimmicks (oh yeah, they existed even back then: hype mongers and Hanon was one of them) that will condition your fingers because whatever thing you play will do the trick (even just an A to E scale) as long as you practice with the intent of training your neuromuscular response to finger and hand action.