two rather different systems
For deep water (which 500mt.. in many ways is). the 295 with a pedigree transducer would be a very well proven solid system. that being said the evo3 will offer more features at a lower point.
as my granny says however.. there is no free lunch, and a system that has more features for less... has to give somewhere, and Simrad would have the lesser build quality of the two.
hypothetical.. or do you have a budget you wish to adhere to?
Moose