Your question is like asking a car forum: What car should I buy I want four doors?
You need to determine what YOU like: interface, menus, touch screen
or buttons or hybrid... The list is endless.
Most suggest you spend some time in a chandlery
and try them out and find what YOU like.
And I continue my repeated rants:
1. That handhelds are simply small chartplotters.
(unless your eyesight is really gone, gone, gone...
2. That putting the GPS
at the binnacle makes you "a slave behind the wheel" and there are better places to put it unless you have a swinging mount.