zero turn mower

 I am looking at zero turn mowers and there are so many choices and price
ranges.  I have settled on the Country Clipper Jazee 2.  Now I have to
decide between the 19 hp Kawaski or the 20 Kohler.  Also need to decide
between the twin stick or joy stick?  Opinions? anyone.
I will also change all oils to Amsoil synthetic oils after break in.  I
will never own any vehicle and not use synthetic oil.