Personally, I think you should just play the B minor sonata. If you want to get to know liszt, it's the only thing he ever did that's worth playing. If you can't play it up to tempo, who cares, at least you're not playing trash. Everything else he did was just the work of a ripoff artist.
Sorry ... but is there an annual award for the most nonsensical comment on the forum?
If so, I suggest this one should be a top nominee.
First of all, Liszt wrote one Sonata -- the Dante qualifies more as a Fantasy. To say his transcriptions of symphonies are sonatas is self-evidently nonsense.
More, saying that the Liszt sonata is the only non-ripoff, valuable thing he ever wrote testifies to a gigantic ignorance. This is the composer of ballade nr.2, Vallée d'Obermann, the two legends, of Funérailles and other meditative or religious/extatic pieces from the harmonies poétiques and religieuses such as Bénédiction de Dieu dans la solitude, Andante lacrimoso and Cantique d'Amour, of the Petrarca Sonetts, Consolations, Elegies, of the variations to Bachs "Weinen, Klagen Sorgen, Zagen", of curious, near-atonal music such as Cypres à la Villa d'Este, Gondole lugubri, Nuages Gris or the Bagatelle sans tonalité, and many other pieces documenting that Liszt is a "ripoff-artist" only to those with an extremely superficial knowledge of his music. Besides, he revolutionized piano playing, he anticipated Wagner and a lot of 20th century music. Last, he was the author of countless orchestral pieces and much vocal music inclding songs and religious masses. If there was a list of the top-ten classical composers, he ought to be in there by practically any standard.
So, yes indeed, if there is an award, congrats, because it is really yours!