Biggles
So., at one extreme is the 'VFR' option which just has a basic GPS engine (no display) and a Transponder.
In the middle would be an 'VFR' / 'IFR' option with moving map only.
At the other extreme is an 'IFR' option with moving map, terrain, ADSB-IN, WAAS etc. etc.
Interesting Q
What kit do you currently have, and what would you ultimately like?