They are simple enough circuits, build both and let us know. From my experience they would both sound musical, but since I haven't built either as standalone circuits with those parts I can't really say for sure. For an amplifier, I would target the SOL (or rather something else).
The only 2 things I would do different to the SOL is to put a Jfet, in common drain, in front of the mosfet to keep the input impedance high, and a CCS on the drain of the mosfet. This circuit, I have built (with different transistors), and it sounds wonderful, with some negative feedback. In fact, I think it's a Zen amp variant. It won't be the best measuring amplifier, but it will be enjoyable to build and simple enough to learn on, and it sounds good.
Edit: in addition to what wakibaki stated above, the Szekeres only amplifies current output. The SOL amplifies voltage and current. There is one more mode of operation for a mosfet, which amplifies voltage but not current. You can do some research for that.
Edited by holland - 9/7/13 at 6:46pm