Hi,
Just my choice - I went for the SH 09 to 13 year model, 2.0 Petrol. It has plenty of space for my stuff and not too bad on fuel consumption considering its 150bhp and 1500KG kerb weight it has plenty of power for my needs.
I cant comment about previous models as I've never owned a Subaru before but I did a lot of research before buying mine, I reckon the symmetrical awd makes them all as good as each other.
Lots of videos on you tube, these helped my decision anyway - "4x4 overland subaru" and "softroadingthewest".
Again just my choice - good luck your adventure sounds great 🙂