Instinct 3 solar vs Fénix 7X solar

I can t decide which one to buy for the same price (459 Euros).

Planning to use it for tracking activities (workout/swim/run/bike) and ocasionnaly tracking SUP/kitesurfing

Want to go solar and MIP for battery duration, not looking after fancy amoled or touch screen.

A bit worried with feedback i m seeing on instinct 3

Also wondering if the small memory of instinct 3 would restrict me from installing apps like Hoolan when available (or any other app)

First Garmin so not use to the garmin stuff ....

would someone care sharing an advice ?

Thanks