I’m currently doing a RTW flight in a Cub Crafters XCub. It has the modern avionics, autopilot and for a Cub type aircraft it’s decently quick but still slower than a 172.
One thing I do really like about it is that it is great for viewing scenery out of both sides of the aircraft. The tandem seating is probably the biggest reason I fly it.
Someone made a modified Cub Crafters XCub which has a pod at the bottom which can be filled with fuel or cargo. Filling it with fuel extends the range from ~600NM to around ~900NM depending on winds ofc.