The All-in-one transducer on the Onix is one of it's biggest advantages ..... Great SI and Excellect DI in one unit.

What is best depends on your budget unless you are lucky enough to get one of the Onix on sale.....Cabelas has had the Onix 10 Si touch on sale for $1499 ....but are out of stock now. The Onix is also available in the NT (non-touch) version....which I think I would prefer and it is cheaper and has better screen visibility than the touch unit.