We're getting to the tipping point where a late low hour 206 is not much different in price to an early 505. OK there's still a bit of difference but they are in the same ballpark nowadays.
Hypothetically speaking, which is the best home for the money? Yes the 505 is more modern, has more advanced technology etc but it doesn't go much faster/carry much more and it's looks are 'challenging'.
I have owned 206s for over 20 years so would like to think that I understand their strengths and costs. The 505 on the other hand is a mystery to me and I have always been wary of the Arrius engine.