I love the piano a lot, but I still think that the guitar rules it for me. And when the 2 come together it's even better

The electric guitar, hands down.

It revolutionized the blues and country, and made rock possible.

The acoustic guitar, harmonica and other instruments were nowhere near as influential and revolutionary.

Basically any instrument that you can bend notes on is great for the blues.

One essential characteristic of the blues is playing a note that is in between the minor and major third. This note is often called a "blue note" and is one of the essential elements in the blues. This is not possible on the piano making it a more difficult instrument to play traditional blues on.

Eric Clapton is credited with re-popularizing the blues.
He was highly influenced by Robert johnson who played acoustic.
So isnt acoustic more influential?

Robert Johnson was only one of several blues guitarists who were a key influence on Clapton, and Clapton didn't repopularize squat.

Just as influential with Clapton were ELECTRIC blues guitarists like Muddy Waters, John Lee Hooker, B.B. King etc. All three of whom were playing electric exclusively by the time Clapton was born in 1945.

By the 1950's, acoustic guitar blues was passe. As a kid growing up in the 50's and early 60's, virtually all the blues guitar Clapton would've heard on the radio, on records and in live performances was electric.

Clapton never recorded a tribute album to Johnson until about three years ago. If Johnson really was his greatest early influence, why didn't Clapton record a tribute album in the early to mid-60's, when he was still considered a blues guitar purist, rather than a rock guitarist?

It was guys like B.B. King, Muddy Waters and Chuck Berry who repopularized the blues. Clapton was a wannabe who swiped the main riff for "Layla" from an ELECTRIC blues guitarist who had originated it years earlier.

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I'd have to say the acoustic guitar.

How about the Mouth Organ, or Harmonica as it is commonly known.

Rock & Roll would've NEVER been born if the electric guitar had never been invented.

The electric revolutionized the Blues, as well as other important genres like Jazz, Country & Western etc.

Charlie Christian was one of the first jazzmen to take up the electric guitar. When a youngster named Miles Davis heard Christian playing on the radio, he decided he wanted to be a jazz musician himself.

When some kids named Paul McCartney, John Lennon and Keith Richards heard Scotty Moore playing his electric in "Heartbreak Hotel", they all decided then and there that they wanted to be rock musicians. Specifically GUITARISTS.

The electric guitar gave Country & Western music a much more powerful, upbeat sound in the 1950's, causing it to evolve to a much higher state. It is now one of the most popular music genres in the world, with an enormous fanbase in Europe, Asia and the Latin world.

And the rest is history. So the answer is quite obvious.

acoustic guitar is all you need.

Piano is easily the best because of it's depth, and versatility. It can be used as either lead or rhythm, and chordal melodies are amazing. I will say, though, listening to alot of Miles Davis has convinced me that Trumpet is a better jazz instrument than the Saxophone. That also may have just been because it was Miles Davis playing it.