Are you looking for user-friendly flexible filament? In that case, Polyflex filament by Polymaker might be the most sensible choice.
As opposed to many other filaments, Polyflex can also be used to print with most bowden style extruder 3D printers. (Bowden extruders press the filament towards the printing head, direct drive extruders will pull the filament into the printing head)
Polyflex is very user-friendly, check out the product pages for more information.