I've built a 6 and a 9 and both proved wonderful XC aircraft. Wanting to do more trips since the demise of my 6, I chose to buy rather than build again, and ended up with a lovely 8. Certainly the side x side versions are more pax friendly, and even more so if you are showing anyone the basics of flying, but despite reservations, my partner loves the 8. She has plenty of room, its very comfortable and she can still get to fly when she wants to. I reckon you will be happy whichever way you go....
Marty in Qld