Is a 240v solar panel setup better than 120v?
Because of Ohm's Law, double the voltage and your transmission losses drop to 1/4 with the same diameter of wire.  Go here and punch in your voltage, actual service amperage, distance and tolerable voltage drop in percent (try different numbers here to see the effects of different size of cable). 

If the distance is rather far, the calc may start talking about fat wire like 6AWG or larger.  Don't buy that, come back and ask us. 

14AWG wire at 120V will be 8.333A (repeating of course), and load a 14AWG wire enough for voltage drop to be an important factor.  Going 240V cuts that by 75%. 

Going 240V also gives expansion "room". 

I can't possibly guess whether the build quality of the solar panels in question has cut corners on current pathways (endangering 120V panels) or insulation and component voltage rating (endangering 240V panels).  Insulation is generally cheaper than current pathways, so all things being equal I'd favor the higher voltage.  

I'm no fan of marrying the PV and the inverter hardware.  If either fails, both are scrap, so you are beholden to the build quality on both of them.  They are also only good for grid tie.  If it's on a roof, love your firefighters.