Fish finder shopping help

[Bmcafee]

I’m stuck between Helix 7 MSI GPS g3 nav, or elite 7 ti2 both $750, or Elite ti total scan nav for $599. Is there a big difference from the Ti to the Ti2? Any suggestions and reasonings on why you would choose one over the other would help. I know the G3 isn’t out yet and TI2 is fairly new still but if anyone knows anything about them and give some feedback I would appreciate it. Thanks