313cc is enough for me to tour around the country when I want to or take it on lazy rides. Don't really need more than that but I may wait for the adventure variant and see if that would suit my needs better. One good point I saw in a comment is that the seat height was designed with short riders in mind. Tall riders may not be comfortable on sub 500cc bikes. Maybe BMW should come out with an adjustable seat and handlebars for people of various sizes?
Ergo's of the adventure version might be what you find more of a difference in. But the current version may already have ergos to your liking.