I think SRV was the best of the three technically for sure, stylistically he was inspired a lot by Hendrix and had the luxury of coming later. Hendrix was a great rhythm player but SRV was inhuman on both rhythm and lead and was every bit as much a showman. Hendrix had more mass appeal than SRV in terms of genre and was probably the most original song writer. Clapton became the most refined/polished/well produced of the three and I probably play/listen to more Clapton than any of them, Clapton and Allman together on *Layla and Other Assorted Love Songs* that album has so much more to offer than just the (amazing) title track... Though again he was the one who lived to produce a lot more material. Page is/was the best/most prolific riff writer who ever lived probably. Yeah he did a lot of straight up blues stuff (for instance Lemon song is really Killing Floor). A lot of his early stuff is just power chords and minor pentatonic but played with a ton of rawness and energy (he would go for anything and didn't care about making small mistakes). Then in later albums he evolves to writing shit like Stairway. He was probably the least colorful/musically sophisticated of this bunch (especially early) but there is a reason you hear as many Zep songs on the radio as you do all of the rest of these guys combined. You could go from beginner to advanced playing nothing but Page songs. Ps. All three of them have a version of Little Wing so you can actually kinda compare them directly.